Squeeze, don't be to surprised when you look down all your barrels and the throat on all of them looks like an alligators back. When I first started using my bore scope, having never used one before, I thought ohhhh no, then immediately called my gunsmith. He told me it was very normal for the throat to look like hel1, and that I'd be surprised at how few rounds it takes before a throat starts showing firecracking and not to worry about it unless my gun starts shooting poorly and or the COAL to touching, has grown a good amount.