Bore Area for BHW AR 6.5X6.8 20" Barrel

[wachtelhund]

Hello. Can someone from BHW please provide the bore area of your 6.5X6.8 20" barrel. I have a 6.5X6.8 AR barrel on order and I use a Barrel Pressure and Projectile Velocity program to calculate load pressures. I believe a normal 20" barrel would be about .05 inch squared, but not sure with your polygonal rifling; since the polygonal rifling produces lower pressures and higher velocities.

[GLSHOOTER]

Send a contact note on this one to BHW. I''d just square 0.132 X.Pi. and call it good. The program us generic Does it differentiate between number of lands and grooves? Groove depth? All they do is give you a WAG that is wrong as often than not. Even throat specifications come into play and free bore.

Greg