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Cylinder binding after firing a dozen rounds or so can also be due to an insufficent barrel-cylinder gap; the cylinder heats up and expands forward, closing the gap and resulting in binding.
Another possibility is ammo that is out of spec or reloads that are stretched or have protruding primers.
I can't diagnose the exact problem without seeing the gun, but the other folks have also given some things to look for.
Jim
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