barrel twist rate formula

barrel twist rate formula

Twist Rate The rates of twist below are expressed as "one complete turn in so many inches" (i.e. I was bored today and decided to discover the commonality of each "most accurate" load from Nosler's Load data. Twist rates for cast bullets as compared to jacketd bullets where tw is the length of one turn of the barrel twist. My Mini 14 twist rate Rifling twist rates. Rifling in the barrel of a canon causes the projectile to spin just as is the case for rifles (hence the name for the grooves in the barrel). 300 win mag twist rate Individual rifles and longer barrel lengths will improve on these numbers, but the 308 Winchester is never going to be a 1000 yard powerhouse. The Truth About The Effects of Twist Rate and Gun Barrel ... Education Shooting Sports USA | How To Calculate Rifling Twist Rates ... These nine weapons had three different barrel twist rates ranging from 1-7 to 1-9.45 inches. For example, 1:10, or 10", is "one turn in ten inches." MV / twist rate = rotational speed; Using metric units, the formula divides the number of millimeters in a meter (1000) by the barrel twist in millimeters (the length of travel along the barrel per full rotation). .22 Long Rifle = … I definitely agree with trying a few types out. I've used 190 SMK in my 300WM with a 30" 1-10 Kreiger for years and it was extremely accurate. To obtain the suggested twist rate click the Twist Rate button. Miller suggests that, while Greenhill's formula works well, there are better and more precise methods for determining the proper twist rate that are no more difficult to compute. Enter Professor Sir Alfred George Greenhill of the British Royal Military Academy, who devised a formula for determining twist rate which, simplified here, multiplies the square of the bullet diameter by 150 and then divides the result by the length of the bullet, and looks like this: (C x D 2) ÷ L = T. A Calculator for Barrel Twist Rate - kwk EABCO The rate of twist is expressed as one turn in so many inches (i.e. Exchange Rates Twist rates in the U.S. are measured as how many inches of barrel are required for the rifling to make one full rotation and are expressed as one turn per X inches of barrel. Barrel Twist How many "inches per turn" is your rate of rifling twist. Also 24 inch barrel but with a 1 in 28" twist. Custom McGowen 6.5mm Barrel Blank. This is a very accurate barrel from the get go, however out of a bolt gun, you have some more flexibility in developing loads. Twist Rate. When we talk about barrel twist rate it refers to the ratio of inches that a bullet needs to travel down the barrel in order to make it spin in one full turn. 338 federal twist rate? 77-22. The simplest is the old Greenhill formula: T = 150 / L. where T is the twist in bullet calibers, and L is the length of the bullet in calibers. Using a constant "C" of 125,.....the 1.4375" long bullet seems optimum for a 1:18 twist barrel in a .45 caliber..458 X .458 X 125 / 1.4375 = 18.24. use a variance of 120 instead of 150. get the right length of bullet for your twist using this formula with a variance of 120 and it will shoot holes in holes at any distance. Proper referencing. The classic formula for twist rate is T = 3.5 * V^0.5 * D^2 / L, which easily shows that the fatter the bullet, the higher the twist rate, and the longer the bullet, the lower the rate of … This twist rate is defined as the distance traveled by a bullet to complete one full revolution. The chamber is of standard SAAMI specification in .308 Winchester and the barrel features a 1:10 right hand twist. (41,600 kg) and the liner 45,860 lbs. Miller twist rule is a mathematical formula created by Don Miller to calculate the optimum rate of twist for a given bullet traveling through a rifled barrel. twist. There seems to be a lot of “opinion” about the issue of Barrel Twist, and particularly the relationship between the twist, groove, and ammunition. A computer program in Basic was written using the above formula to calculate the effects of a change in twist rate or the amount of bullet imbalance. The simplest is the old Greenhill formula: T = 150 / L. where T is the twist in bullet calibers, and L is the length of the bullet in calibers. Updated versions of this formula account for velocity and atmospheric variables. I understand on the post 2011 M&P barrels they’ve switched to a 1-24 to … … The image shows a view down the barrel of a cannon, emphasizing its rifling. Explanation of terms. With most modern AR rifle barrels you’ll hear the AR-15 barrel twist rates expressed in terms like 1:7 or 1:9. Twist: Uniform RH 1 in 25: Chamber Volume: 27,000 in 3 (442.5 dm 3) Rate Of Fire: 2 rounds per minute: The primer cartridge can be fired either electrically or by percussion. Let’s recap a little history on rifling so you can look like a genius the next time you are done shooting and hanging out with your friends. It takes less twist to stabilize a given bullet at high velocity than at low velocity. With a gain twist barrel the bullet cannot go to sleep. Maglite® - 40+ years of designing and manufacturing America’s best flashlights and accessories. The rate must be constant for the utmost accuracy. On the opposite end of the spectrum – Decreasing the twist rate will almost certainly result in … A build using accurized, match grade, stainless steel barrels (most certainly heavy profile) has much more going on than just twist rate. The classical equation to calculate gyroscopic stability is as follows. where the standard twist rate is 1:12. The Greenhill Rifling Formula is used to calculate the optimal barrel twist rate for stabilizing a bullet's flight given the bullet's diameter ( D ), length ( L ), specific gravity ( SG) and velocity ( V ). Now we have everything we need to write the equation for barrel twist needed to stabilize the bullet when it just exits the barrel. We will guide you on how to place your essay help, proofreading and editing your draft – fixing the grammar, spelling, or formatting of your paper easily and cheaply. 2782b123-aa3e-11e9-8682-bc764e2038f2. Replacement Barrel for your Savage, Remington and Remage rifle. So let’s say your barrel has a 1/7 twist rate. For instance, a twist rate of The barrel has a 1:10-inch twist rate, is covered with a ventilated aluminum shroud and can be ordered with a muzzle threaded ½x28 tpi for common accessories or … for improved accuracy performance and the thread pattern is 1/2–28. ). Re: 300 win mag twist rate. Figure 8. Keep in mind that twist rate is not all that it boils down to. L = Bullet length in inches. Step 2—Finding C x D 2 : 150 x .05953 = 8.9295. Doing the same for an 80-grain bullet 1.075" long: Every flashlight made by Mag Instrument, Inc., represents one man’s abiding commitment to product quality, and to the cause of keeping flashlight-industry manufacturing jobs in America. Extreme accuracy delivered quickly! By this I mean how would one take into consideration the potential use of boolit "A" of weight "B" and diameter "C" and calculate a minimum and maximum usable velocity "D" and "E" taking into consideration the one constant, … This is almost exactly like the Trajectory calculator above, but it includes inputs for barrel twist, twist direction and bullet length. Shynloco said: Guys, I will be having a 6mmbr barrel put on a Remington 700 SA Benchrest Rifle. These were taken from various sources. The suggested twist rate is rounded to the nearest half inch or centimeter that results in a gyroscopic stability factor of at least 1.5 at ICAO sea level air density. Because the barrel's twist rate is "fixed", the only way to vary the formula is to use different weight bullets or different velocities. Five grove, cut rifling is still the standard I believe for all S&W barrels. The formula for twist rate is the Greenhill Formula. Finished Barrels. Get the latest news and analysis in the stock market today, including national and world stock market news, business news, financial news and more First we calculate l = L/d, which gives us l = 1.18 / 0.308 = 3.83117. The cartridge is automatically ejected when the breech opens after firing. You can select up to two different pre-workouts, all which come equipped with a powerful ingredient formula that sets you up for success. Likewise, a barrel with a 1:8 twist rate will spin the bullet twice as it travels down a 16-inch barrel. Greenhill Formula. For those who cannot leave well enough alone, here is a formula for calculating twist rate: What follows is a list of the rates of twist for common rifle cartridges. The same is true of musket balls and bullets. I had a new barrel made with a twist of 1 in 20 for 45-100, and it does great with 500 grains, but I don't think it'd stabilize a 600 like the chart suggests. Durable, Functional, & Long-lasting! A champion of free enterprise and U.S.-based manufacturing, Anthony Maglica is the president of Mag Instrument, Inc. and the creator o The ammunition used for this test is of several types, all of which are of corresponding lot numbers. However, even though the 90's produce good accuracy most of the time and have a significantly better BC than the 80's, I notice some inconsistency with the 90's while the 80's produce small 5 shot groups more consistently than the 90's. Typical value for this input is between 1:7" and 1:13". 1 in 9", 1 in 10", etc. At a muzzle velocity of 2,000 fps, that same bullet will be spinning at 1333.3 rps or 80,000 rpm. The same high quality you have come to expect from McGowen Precision Barrels. We use this formula in the Berger Twist Rate Calculator to help you determine what the best twist rate for a given bullet. The resulting twist rate is the length in which … Twist rate is the ratio of how tight the rifling spirals are in your barrel. Individual rifles and longer barrel lengths will improve on these numbers, but the 308 Winchester is never going to be a 1000 yard powerhouse. 1974- 1986 is 1 in 10. The following tables are based on the Greenhill Formula. .17 HMR = 1 in 9". Here are some considerations: barrel length and twist rate, long VLD-type bullets, heavier VLD-type bullets and shorter barrels may require a faster twist. w depends on the barrel twist and initial velocity "v" w = 2*pi*v/tw. This is the least-versatile twist rate you'll see in the 5.56x45mm/.223 Remington chambering. The first number refers to one full rotation of a bullet. Unfortunately, it's not a very good method, but I include it here to show that longer bullets require … Before I rebarreled my rolling block, it had a twist of 1 in 22 for 45-70. The first equation we will study is the Greenhill formula, which was developed by Sir George Greenhill, professor of mathematics at the Royal Military Academy in London, way back in 1879. Barrel Twist, RPM, and Miller Stability Calculator. There is an optimum twist rate for a barrel given specific projectile. Rate Of Fire about 2 rounds per minute ^ The sliding breech block weighed 7,940 lbs. Rate & Stability Tables below to help pick the right bullet. m = 180 grains. Editor/authors are masked to the peer review process and editorial decision-making of their own work and are not able to access this work in the online manuscript submission system. (20,800 kg). The formula is E=.000046(T), where T is the rifling twist rate and E is the amount of imbalance to cause one MOA divergence. When the 6.5 Creedmoor cartridge was announced in If you know the rate of twist of your rifle barrel, something called the “Greenhill Formula” could be a big help when it comes to finding that magic pill. The caliber, length, shape and velocity of a bullet determine its optimum twist rate. (Learn More). Explanation of terms. (credit: Elsie esq., Flickr) For a bullet, the specific formula below uses the bullet's MV and the barrel's twist rate to calculate rotational speed: MV(in fps) x (12/twist rate in inches) x 60 = Bullet rpm; For example, a bullet with a muzzle velocity of 3050 ft/s fired from a barrel with a twist rate of 1 in 7-inch (180 mm) (e.g., the M16A2 rifle) spins at 313,714 rpm. However, this does not mean that all barrels chambered for a certain cartridge will have the same twist rate and it is in your best interest to verify your twist rate yourself. ... New Formula for Gyroscopic Stability of Open Tipped Match Style Rifle Bullets. information. Double Barrel makes all this possible. So, 1:12.06-inch, rounded to 1:12-inch, is our standard twist rate for the .223 Rem. Likewise, 1:12 is one rotation per 12 inches, etc. (3,600 kg), the barrel 91,710 lbs. Nov 2, 2021. Interestingly enough the Army’s match barrels are 1:8 twist and provide good accuracy with the M855a1 round. The standard twist for a rifle barrel is designed to stabilize the range of bullets and velocities normally associates with that particular cartridge out to very long range. If you know the rate of twist of your rifle barrel, something called the “Greenhill Formula” could be a big help when it comes to finding that magic pill. Given the same bullet diameter, lighter bullets require a slower rate of twist and heavier bullets require a faster rate of twist. Made up this excel spread sheet to calculate the RPM, Miller Stability and suggested Barrel Twist in one place. If a barrel twist is entered, the program will also plot a graph of Stability Factor as a function of muzzle velocity for this rate of twist. Rifling is often described by its twist rate, which indicates the distance the rifling takes to complete one full revolution, such as "1 turn in 10 inches" (1:10 inches), or "1 turn in 254 mm" (1:254 mm; sometimes expressed as "1:25.4" cm, or … I have been shooting 100 yd using 68gr bullets with extremely tight groups out of a Match Krieger 1:13.5 Savage Model 12 BR. The Greenhill Twist Rate Formula is only a recommendation proven through years of usage. Calculate Twist Rate, Bullet Length and Muzzel Velocity for optimum bullet stability This algorithm and the constant 3.5 was suggested by Charlie Dell, in his book, "The Modern Schuetzen Rifle" and brought to my attention by "Tailhook" a member of the MSN BPCR discussion forum. Barrel length effect on AR 15 terminal ballistics, The military has a formula as shown above for lbs of energy. The Miller twist rule is better than the Greenhill rifling formula when measuring the specific gravity (SG) of a boat tail bullet because the Greenhill formula was originally developed for football shaped projectiles at subsonic speeds and is quite inaccurate for modern bullets.The Miller formula can calculate stability much more accurately for modern long range bullets. The program will calculate what barrel twist is required for a Stability Factor S = 1.5 and plot a graph of this twist as a function of muzzle velocity. These values are used to calculate spin drift using an approximation developed by Bryan Litz and published in his book, Applied Ballistics for Long Range Shooting . Matching your barrels twist rate to the correct weight ammunition can often get you a head start to shooting your firearm to its full accuracy potential. The second and probably most technical aspect to bullet choice is ballistic coefficient. … 1 in 9", 1 in 10", etc. Greenhill's Formula is a ppoular means of calculating the correct twist rate for a given bullet. These were taken from various sources. The grooves cut into the interior of the barrel are known as the barrel's rifling and are measured in terms of twist rate. #5 . To make the math easy, this means a bullet will rotate three times as it travels down a 21-inch barrel with a 1:7 twist rate (21/7=3). Twist rate is the rate of spin inside your rifle barrel. For example, a 1:7 rate of twist will cause the bullet to rotate one time for every 7 inches of barrel length. 1 in 10" or 1:10). 180 for velocities over 2,800 fps An increasing twist rate will have little effect on accuracy except in the most extreme cases. The Greenhill formula indicates that a proper twist rate for this bullet would be 32 inches. Twist = Twist rate, one turn in xx inches D = bullet diameter in inches C = 150 for velocities up to 2,800 fps. The figures in the table are from this program. Nine inches of travel for each rotation gives the barrel a 1:9 rifling rate. 180 for velocities over 2,800 fps. For example, it’s commonly known that a 1/7 twist rate is good for 62 gr M855 as well as 77 gr SMK, but a lot … Innovation includes: patented Heat-Sink LED technology, fast-charging rechargeable flashlights, Quick-click tail-cap mode selection, programmable, multiple-functions and long run-times. Five grove, cut rifling is still the standard I believe for all S&W barrels. Companies routinely report the barrel twist rate information in their documentation and some stamp it … I have tested this on several occasions and found the same answer with each test. ( Sg S g) is the gyroscopic stability factor, and must be above 1.0 if the bullet is to remain stable. t = twist rate in calibers per inch (do twist rate divided by caliber) d = caliber L = the length of the bullet in calibers (bullet length in inches divided by caliber) Rifling is usually expressed as a twist rate; that is the length required to complete a full revolution along the horizontal access. I have been shooting 100 yd using 68gr bullets with extremely tight groups out of a Match Krieger 1:13.5 Savage Model 12 BR. putting new barrel on, 338 federal, 20 inch tube, thinking that 1-10 is the way to go for both j and cast, but possibly 1-12 might be better for the cast and the j's will just have to stay on the 180 to 200gr. T wistRate = C ⋅D2 L ⋅ √10.9 10.9 T w i s t R a t e = C ⋅ D 2 L ⋅ 10.9 10.9. We offer finished barrels for AR-10, AR-15, Savage Rifles, Ruger 10-22, and Ruger. The development team had to overcome one problem in particular. * Mini-14 serial numbers rollmarked with Mini-14 Ranch Rifles beginning in 2000 Ranch Rifle Thin barrel, ejector in the bolt stop assembly, scope ring scallops cast into the receiver, buffer sytem using the recoil spring. World currency exchange rates and currency exchange rate history. He mentioned Greenhill's work began with cannons in1879. Step 3—Divide result by bullet length: 8.9295 ÷ .740 = 12.06. Mini 14 twist rates. Mr. Jack Daniel himself traveled to St. Louis, Missouri, for the 1904 World's Fair, and against all odds, he came back to Lynchburg with the 1904 Gold Medal for the world's best whiskey. We ran 210 Berger's in his and those worked better. #2. The original QBZ-95 bullpup and the QBZ-03 had the slowest twist rate of 1-9.45 inches while the newer QBZ-95-1 bullpup and the QJY-88 GPMG have a faster 1-8.21 twist rate. Anybody who has thrown a football on Thanksgiving knows that when you put a little spin on the football and successfully throw a spiral, your throw is more accurate. d = bullet diameter in inches 4. l = bullet length in calibers 5. t = twist in calibers per turn Output is red for unstable, yellow for marginal stability and green for stable. Twist = Twist rate, one turn in xx inches D = bullet diameter in inches C = 150 for velocities up to 2,800 fps. The number 15.068 is then the minimum barrel twist-rate required to stabilize that particular bullet. For instance, rifling that spins the bullet one full rotation per seven inches of rifling is a 1:7 twist. Unlike some brands who hide their low-quality ingredients behind proprietary blends, we show you every ingredient we use as well as provide their doses. Calculate a stability factor for a bullet using the Miller stability formula. Balls cannot compete with conicals and saboted conicals in speed and energy in today's high twist, short barrels. A cut barrel even with a straight twist is more uniform and consistent than a button barrel. The 1909 extractor is easily modified, or swapped for a later 98 Mauser extractor. If a barrel twist is entered, the program will also plot a graph of Stability Factor as a function of muzzle velocity for this rate of twist. Ken Howell wrote about twist rate in the 07/1999 issue of VarmintHuntermagazine. Our projectile motion calculator is a tool that helps you analyze the parabolic projectile motion. The reason is that the GH formula, doesn't solve for center of gravity. Barrel Twist Rate Calculator. I swapped the barrel for a 30" 1:6.5 twist PacNor and now the 90's work well at 2730 to 2740 fps using Varget. Likewise, 1:12 is one rotation per 12 inches, etc. Many gunsmiths do not know the 1909 extractor and and will cuss as they try to make it feed. S&W standard 9mm barrel twist rate was 1-18.75 or 1-16, (depending on who you talk to.) side and not the 250 and up. Output is red for unstable, yellow for marginal stability and green for stable. For instance, rifling that spins the bullet one full rotation per seven inches of rifling is a 1:7 twist. In my opinion, the Greenhill Formula is a little outdated. The variables are as follows: Sg S g. The gyroscopic stability factor. Plagiarism. Step 1—Finding D 2 : .244 x .244 = .05953. Over the last 60 years most rifle offerings from Winchester, Remington and Ruger have followed the formula that it is better to spin 'em too fast than it is to spin 'em too slow; therefore, most all .30 calibres and .270s feature a 1 revolution in 10 inch barrel twist. Uberti uses a a better rifling twist rate IMHO. The short technical answer is that barrel twist starts the bullet spinning at a given rate to stabilize the bullet. What Is Barrel Twist Rate? rate in inches (top-most row). The rates of twist below are expressed as "one complete turn in so many inches" (i.e. d = 0.308 inches. Marlin as well, proper rifling in the 38/357, musket ball rifling in 44, 44-40 and 45 Colt. Twist rates are expressed by a ratio that starts with 1 (1:7, 1:10, 1:14, etc.). Some of the many variables included powders, primers, and rifle parameters like chamber dimensions, twist rate, and barrel length. The Greenhill formula is obsolete and will give a result with to fast a twist, except in LR, cast bullets (600+ yds). In the last couple of posts, we saw the Greenhill formula and the Miller twist rate formula as two methods to calculate the twist rate of barrels. The Miller twist rate formula is a calculation that is used for predicting Specific Gravity (SG) for modern long range bullets based on bullet mass, diameter, length, and rifling twist. Mini 14 rate of twist 1. Up-to-the minute currency conversion, charts and more. By putting a spin on the projectile, it helps the projectile … However, Greenhill derived his equation in ca.1879 based on the conical shaped projectile propelled by black powder. The figures in the table are from this program. Once the basic formula was solved for the 6.5 Creedmoor cartridge design, it was a matter of a lot of experimentation and optimization. To determine the optimum twist rate of a barrel, several people have developed various rule-of-thumb equations over the years. Twist rate refers to the rate of spin in the rifle barrel, and is represented in inches per turn. It's important that your barrel has an adequate twist rate to stabilize the bullets you're shooting. A barrel that is a 1:10" twist means that the rifling will spin the bullet one revolution in 10 inches. The short answer is that barrel twist starts the bullet spinning at a given rate to stabilize the bullet. For example, a 45 [. ] 180 for velocities over 2,800 fps The formula for twist rate is the Greenhill Formula. Including bullet length and barrel twist rate. The final check includes: Compliance with initial order details. Miller twist rule is a mathematical formula derived by Don Miller to determine the rate of twist to apply to a given bullet to provide optimum stability using a rifled barrel. Miller suggests that while Greenhill 's formula works well there are better and more precise ways to calculate what the proper twist rate for a bullet should be that are not much more difficult to calculate. That means once fired, a projectile will need to go 7 inches down the barrel in order to make one full turn. Barrel Twist Rate Calculator. Twist rate Spoken pronunciation ... look up the green hill formula. Jack Daniel's 1904 Gold Medal 100th anneversery . As much as I respect Greenhill, I have, however, adopted a variation of his formula based on my own shooting over the years. A well known program called McGyro was written by the late Robert L. McCoy in the 1980s. The high satisfaction rate is set by our Quality Control Department, which checks all papers before submission. So if you are asking your twist rate so you could figure out whether or not your rifle will stabilize x bullet then you have a little more research to do. When first introduced, barrels for the .244 were made with a 1:12" twist, because Remington anticipated that their new cartridge would be used primarily for varmint shooting. The 1 in 12 inch twist is ideal for best accuracy with varmint weight bullets (70-85 grains) in a high velocity .24 (6mm) caliber rifle. At each range, handloads were … Thinner air results in higher stability, and vice versa. Custom twist rate, length, and contour all delivered in just a few short weeks. Although 1-in-14 barrels can stabilize 55-grain bullets used by the original M16, it's really better suited for bullets up to 50- and 52-grains—most of which fall into the varmint and target category. Tighter, faster twist rates are needed to stabilize longer, heavier bullets. Using them will allow you to estimate the heaviest/longest bullet a gun will stabilize based on the caliber (left-most column) and . A bullet traveling down a 1:9 barrel at 2000fps = 160,000rpm 1:9 @ 3000fps = 240,000 rpm, 1:9 @ 4000fps = 320,000. 1 in 10 inches, or 1:10), is designed to stabilize the range of bullets normally used in a particular caliber to a distance beyond the practical range of the cartridge. Our McGowen Barrels are all top quality 416R Stainless Steel, button What barrel length, twist rate, and velocity of bullet for suppressors? Sg = 8π ρairt2d5CMα A2 B S g = 8 π ρ a i r t 2 d 5 C M α A 2 B. This number is used along with other inputs to determine the stability and related trajectory metrics. AJOG's Editors have active research programs and, on occasion, publish work in the Journal. In 38/357 they are the same, and good. The formula for twist rate is the Greenhill Formula. The Miller Twist Rule is used to calculate the optimal barrel twist rate for stabilizing a bullet's flight given the bullet's diameter ( D ), length ( L) and mass ( m) . Each barrel comes with a thread protector with a captive o-ring. It is the defacto standard for this type of computation. A case in point is the 178-grain ELD-X to be loaded in .308 Win. Most calibers have fairly common twist rates such as 1-10” for .308 Winchester, 1-9” for .223 Remington, 1-8” for 6.5 Creedmoor, and so on. It did not stabilize 500 grain bullets--it was best with 400 grainers. The 1 in 12 inch . These are then Two-Pass button rifled in the various twist rates we offer to suit particular accuracy requirements. However in an identical rifle my buddy has the same round sucked compared to my barrel. D = bullet diameter in inches. There are only eight input fields: BC, bullet caliber, bullet weight, bullet length, muzzle velocity, barrel twist, temperature and altitude. Berger’s Twist Rate Calculator is perhaps the most comprehensive, yet at the same time the least-complex for the layman. The Barrel Outlet's Barrel Twist Calculator Calculator is a tool for determining the Gyroscopic Stability (GS) of your bullet and is based on the Don Miller twist rule. The platform used for this is a Shilen match barrel which began at 26 inches in length and ended at 13.5 inches. 43 inch barrel with 1 in 66" twist, black powder FFFg #6 . Berger’s free tool is ideal when we’ve got our heart set on a specific bullet and want a custom or factory barrel with a most complimentary twist rate. 7mms are usually one in nine. Guys, I will be having a 6mmbr barrel put on a Remington 700 SA Benchrest Rifle. S&W standard 9mm barrel twist rate was 1-18.75 or 1-16, (depending on who you talk to.) Interesting, eh, that so many handgun bullets should end up with so similar calculated twist rates? The first Gold Medal to be won by the Jack Daniel Distillery was a special one. This method does not give an easy or straightforward understanding of whether a twist rate is relatively slow or fast when bores of different diameters are compared.

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