Is the brass case that you are trying to use in your artie, a case that has been fired from said gun? If not, and it is a "pickup" that has not been resized in a reloading die, I would not be surprised to find what you are experiencing. If you have a good set of calipers, measure the spent brass just above the extraction groove, and then compare it to new ammo. Also check the case mouth of both. You may find your answer....Just a thought.
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