I think we need to start with what loads you are using in the gun. The symptoms you are describing sound more like incompetent reloading or using ammunition too hot for the level of proof of the gun. I’m going to suggest that you cease using the gun until this is sorted.
A good, clear, photo of the barrel flats of the gun would be helpful. If you can’t get the photos up, email them to me, and I will post them for you.
tedjs@usfamily.net
By the way, welcome, and nice to see a first time post. Most of us are old, cagey, and gruff, but, you’ll get used to it.
Best,
Ted