Help...anyone ever have a throat tighten w/use?
I'll try to keep this short & sweet:
I have a new 30-338 rifle (M70 & Krieger bbl.). When I got it I noticed a couple light scratches on chambered bullets, just past the neck. There was no resistance going in or out, and I thought they were burrs that would fire out.
I put 100 rounds through it, and it shoots great, tested out to 600 yards.
Well, today I go out to shoot & verify zero, and I notice that it is hard to chamber a round. I shoot anyway and it shoots ok. Then I try to extract a live round, and the bullet sticks! (this is the same everything-bullet, seating depth, etc.)
At home, I examine bullets that are extracted, and they have a full, circular, burnished ring around them. They are not hitting the lands, but are sticking in the throat. It appears that the throat has tightened up on it's own!
I thought about fouling, but have scrubbed it good, and shining a light inside it reflects back like a mirror.
Can anybody shed some light on this?
Thank you for any help. Doug