I use 400 grit emory cloth to polish the chambers. You may also have a case where the fir
ing pin has struck the chamber and left a burr. I have also had trouble with some kinds of ammo such as Remington. They are loading the ammo for maximum velocity and have thinned up the cases to save brass making them expand more than they used to. I have had problems with split cases especially with Remington. Try some Federal ammo.
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