Texas Sheepdawg wrote:If you guys could have a single shot break over 450 Bushmaster what barrel length and twist rate do you think would serve as the most versatile choice?
22" and 20t
Hoot wrote:The biggest factor I've seen with the 1:16 twist is rarely mentioned. The greater the spin rate, the greater the resistance to the bullet going down the bore, the greater the back pressure. I saw higher pressure signs in my cases at what were acceptable loads using Lil Gun and a 1:24. That should not come as a surprise when you think about what's going on in there. The solution may be one of using a slower powder, with just reducing the charge being the easier solution. Don't confuse continuous bore pressure with immediate chamber pressure. They're related but not synonymous. Also, many equate heavier bullets with faster twist rate, whereas it's more about the length to diameter ratio of the bullet. The confusion is easy to understand as in most rifle calibers, a heavier bullet is in fact a longer one. With 300gr HP bullets like we see in .451-.452, their weight increase in not proportional to their length increase.
Just my opinion though...
Texas Sheepdawg wrote:Apply the theory of what you're saying here to a 20" barrel. Single shot. No gas system. Ejection is same as a New Englander shotgun. I know you'll probably be giving a hypothetical observations, that is, unless you turned your gas system off during your tests with the 1:16 AR barrel.
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