Bradford

I had the same issue with a Ruger sr 762 and found that I was not seating the bullet deep enough. You have to measure your seating depth in your barrel with your bullet type to make sure the bullet is not hitting the rifling before the roundt is in battery. I found that out when I had to tap my bolt back and the bullet was stuck in the barrel. Check that.

I reload for a SR 762 (.308). I measured the seating depth on the 175 grain bullet I am using and measured about 2.720. Every gun is different. I try to make my bullets OAL 2.720 but I get from 2.714 to 2.728 because of the differences in each bullet. I first tried to make them 2.8 like the manuals say and bullets were jamming in my gun. You must realized that each bullet has a ogive that meets the riffling in the barrel and that is a far in as that bullet should be when going into battery. Now the ogive is different on every type of bullet. Even bullets of the same type some will be a few thousandths longer or shorter. If your bullet is too long when going into battery the bullet will be forced back into the case or the bolt wont close and lock. If your bullet is too short this is called the "jump" distance that the bullet needs to move before it contacts the barrel. Your riffle will perform best somewhere between these two places. You need to figure out where and it will be different for each style bullet. Now I have totally confused everyone..lol