I have had ejectors act up from the brass expanding. And I have even had issues with the actual hull expanding too. But all of these issues were on reloaded hulls that were all used up.

Understood, but my problems are with new RST shells. It's not the shell's fault but rather, the fault is in the i.d. of the right chamber. Nonetheless, the gun will only open with great force after firing the right barrel - no problem at all with the left.

Any shells that I have had issues with have been RST as well.

If your Cartridges are loaded in Cheddite hulls with Foreign primers it's a likely cause of opening problems. My 10 G hulls are about half Cheddites half Remington obvious difference in hull quality. Primers even more so. Factory primed cheddites pierce about 10% in myParker,hammer gun which causes the gun to drag on opening. Never ever had a Winchester primer pierce in any of my guns.

I have had double guns hang one chamber not the other which is a different thing, and careful hone cured it.

William