Brian,
I had the same problem on a 16 Trojan. Shooting cheap factory stuff, no problem. Shooting my reloads, problems.
Quite a difference in primers, their hardness and material, and depth the pins would drive into primer. Also a difference in head sizes of resized spent hulls. There were no internal problems with gun but when I shot both barrels, thought I would break the gun getting it to open.
Change shells and see if it does not go away.
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