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Rangermonroe,
Got a question to throw at ya and something for ya to think about.
How many times have you sized these cases?
If you have full length sized them a few times they may be becoming "work hardened" which it kinda sounds like might be happening. This is caused by working the brass numerous times and can make the mouth and shoulder "hard" per say. Cases can be annealed, or heated up to where the brass is soft enough to "flow" again.
Smedley
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