If you don't have a case gauge remove the barrel from your gun and use it as a case gauge. You should be able to determine what is wrong. I load cast bullets and no matter what I do I have a few that won't go in my gauge. So far the defects all chamber in my autos but they don't all chamber in my 625 revolver, it has tight chambers. Remington brass seems to be thinner than the others, they all seem to pass in the gauge. Cast bullets are usually .452 vs .451.
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