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6 days ago · AR-15 Rifling Rates: A Closer Look. For AR-15 rifles, the twist rate is a critical factor in optimizing bullet performance. Although the original AR-15 rifle designed by Eugene Stoner was designed with a 1:14 twist rate for the lighter projectiles of the time, and standard issue AR-15s still have the same, modern common rifling rates for AR-15s include 1:7, 1:8, and 1:9, with each suited to ...
Aug 15, 2019 · The Miller Formula. Don Miller developed this formula as a more accurate way to find an ideal rifle twist rate. Whereas Greenhill was more of a generic formula, Miller’s uses more characteristics of a rifle bullet to arrive a a more tailored solution. m = bullet mass in grains.
Jun 29, 2022 · The two most popular bullet weights for 5.56 are 55 and 62 grains. From our chart you will see that the best twist rate for 55 grain ammunition (e.g. PMC M193) is 1:12” or 1:10”. The best twist rate for 62 grain ammunition (e.g. M855) is 1:8”, 1:9” or 1:10”. (We would advise sticking to the faster of the three best twist rates for 62 ...
The early M16A1 utilized a rifle twist rate of 1:12 to stabilize the 55 grain M193. After the adoption of the M16A2, the military started using a 1:7 rifle twist, which was faster. The rifling made a complete revolution within 7″ now instead of 14.”. We are talking twice as fast.
- How Rifling Works
- How to Match Ammo to Twist Rate
- OK – Now What?
It all starts with rifling. A rifle’s barrel is cut (by one means or another – that’s a separate topic covered in our blog about types of rifling) into lands and grooves. The land is the part of the barrel that is not cut, while the groove is the “trough” cut into the barrel. The cuts go in a spiral around the inside of the barrel. The bullet, when...
Let’s get things going with matching ammo to twist with this chart for the .223/5.56mm. Let’s try to follow my rule of thumb above… understand that innate accuracy will be better if you keep the “small-number-twists” for the longer and heavier bullets, and the “larger-number-twists” for the lighter, smaller ones. Of course, there are exceptions… as...
Learning about rifle barrel twist rates isn’t high on the list of most shooters… unless they like one-hole groups at ridiculous ranges. Going the other way, ever seen a target with a perfect silhouette of a bullet cut through it? The bullet keyholed due to insufficient stabilization and went sideways through the target. Not a good thing. Granted, f...
Sep 11, 2022 · In 2007, Savage added a 1:7-inch-twist-rate barrel to several models, but when it entered the AR-15 market in 2017, the company settled on the 1:8-inch twist for its MSRs in .223 Rem. or 5.56 NATO.
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Not all rifle barrels of the same caliber have the same twist rate. A fellow ordering a custom rifle may have his own ideas about twist, as may the builder. For example, some .270 Win. barrels are rifled with a 1 in 12 inches twist, some .30-06 barrels are also rifled 1 turn in 12 inches and some .300 Magnum barrels are rifled 1 turn in 14 inches.
