I had a similar problem once, bolt wasnt closing. try taking your finished round and drop it in your case gage. If you checking your brass with the case gage before you seat a round and it fits fine is good, but you should always check after you seat a bullet. My problem was I was bulging out the shoulder from too much crimp.
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Lock and load, the zombies (democrats) are coming (to take your guns)!
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