08-12-2012, 09:50 PM
Here is a thread where Bill Alexander weighed in: http://www.65grendel.com/forum/showthrea...twist-rate see page 1 for a couple of his responses.
Mind you, he was discussing gas guns specifically. With the bolt gun, the pressure can be raised from the 50,000 psi gas gun limit to approx 57,000 psi.
I am choosing the 8" twist for my gun to give me the option of shooting 130 and 140 grn Berger VLDs and stabilize them.
For your case, either the 8" or 8.5" would be fine. BStokes uses a 8" twist in a 20" bolt gun and has good results shooting 130 grn bullets.
Mind you, he was discussing gas guns specifically. With the bolt gun, the pressure can be raised from the 50,000 psi gas gun limit to approx 57,000 psi.
I am choosing the 8" twist for my gun to give me the option of shooting 130 and 140 grn Berger VLDs and stabilize them.
For your case, either the 8" or 8.5" would be fine. BStokes uses a 8" twist in a 20" bolt gun and has good results shooting 130 grn bullets.