They definitely do not like hot loads. They can ding the rails on the top inside the receiver. Run your finger along the the top of the receiver and see if you can feel anything like a burr or a ding. You can't always see it.
I had that problem with one I used to have. I bought it used and the previous owner must have run some pretty hot loads. I cleaned it up and it ran fine.
“If ye love wealth better than liberty, the tranquility of servitude better than the animating contest of freedom, go home from us in peace. We ask not your counsels or arms. Crouch down and lick the hands which feed you. May your chains set lightly upon you, and may posterity forget that ye were our countrymen.” ― Samuel Adams