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
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