May 18th, 2022
Here are extreme.224-Caliber bullets. You must also consider MV when choosing a twist rate. Different bullet types may need different rates of spin to stabilize properly. The bullet’s initial speed (RPM), is a function both of the bullet’s muzzle velocity, and the spin created by the barrel’s rifling. Your bullet should be stable during flight. Bryan Litz, Applied Ballistics, says that it is better to have too many spins than too few. Glen Zediker, the late Glen Zediker, provided basic tips regarding barrel twist rates as well as bullet stability. These tips are from Glen Zediker’s book Top Grade Ammo. Choosing the Right Twist Ratio
I would rather have a twist too fast that not fast enough. Generally… I recommend going with the faster side in a barrel twist decision. 1:8? twist is the new standard for.224 caliber. It replaces 1:9? This is a good thing. New bullets are generally larger than older ones. You shouldn’t let a slow twist limit your ability to [achieve] better performance long-range. Also, consider the lengthiest and heaviest bullets that you use. This will also affect your bullet choices. A 1:12 is the best choice if you shoot a 55-grain.224 bullet. A 1:10 is also acceptable for.308 caliber. Unless you are shooting over 200-grain bullet weights, a 1:10? Bullet Length is more important than weight.
The bullet length (not weight) determines how much rotation is needed for stability. Although the most common twist rate suggestions are made with regard to bullet weight, it is more of a generality than a rule. The reason is that with the introduction of higher-ballistic-coefficient bullet designs, which are longer than conventional forms, it is easily possible to have two same-weight bullets that won’t both stabilize from the same twist rate.Evidence of Instability
The tell-tale for an unstable (wobbling or tumbling) bullet is an oblong hole in the target paper, a “keyhole,” and that means the bullet contacted the target at some attitude other than nose-first.Increasing Barrel Length Can Deliver More Velocity, But That May Still Not Provide Enough Stability if the Twist Rate Is Too SlowBullet speed and barrel length have an influence on bullet stability, and a higher muzzle velocity through a longer tube will bring on more effect from the twist, but it’s a little too edgy if a particular bullet stabilizes only when running maximum velocity.My failed 90-grain .224 experiment is a good example of that: I could get them asleep in a 1:7? A twist barrel of 25 inches was chambered in the.22 PPC. However, they could not be stabilized in a 20 inch 1:7? .223 Rem. .223 Rem. There are many helpful articles in that book on technical topics. These are links to Glen Zediker’s books.
Similar Posts:Tags: .223 Rem, AR 15 Book, Barrel Rifling, Glen Zediker, Midsouth Shooters Supply, Top-Grade Ammo, Twist Rate
