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Harold, a rimfire firing pin should be flat and appear to be retangular when looking at it from the front. Clean firing pin recess and check the hole for dings or burrs. I have had success in the past with stretching a firing pin by a couple of thousandths by laying the forward part flat on an anvil and giving the body of that forward part (the smallest diameter, part that strikes the case rim) a few raps with a ball peen hammer. Sometimes a couple of thousandths is all it takes. Check your firing pin protrusion. It should be around .040". George
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