thanks for the interesting and informative post
btw you may have fouling built up in the brake ID remove it temporarily and run an 8mm drill,
through it to be sure clearance of the bullet through it was not an issue,
then re-install it and see if it changes the results
most 30 cal muzzle brakes are 8mm internally
Last edited by hardcastonly; 03-25-2019 at 06:02 AM.