If the receiver face is not square it throws off the alignment of the bolt face to the barrel extension. Curious if you lapped the front of the upper receiver? Another culprit can be a short chamber where the bullet is jammed into the rifling which can spike pressures.
If I really wanted a 10.5 inch 6.5 Grendel pistol I'd buy one of rebby group buy Lilja 6.5 Grendel barrels. BCA has become a very common topic on this forum since they entered the 6.5 Grendel market.
http://www.65grendel.com/forum/showthrea...r-round-2)
If I really wanted a 10.5 inch 6.5 Grendel pistol I'd buy one of rebby group buy Lilja 6.5 Grendel barrels. BCA has become a very common topic on this forum since they entered the 6.5 Grendel market.
http://www.65grendel.com/forum/showthrea...r-round-2)