BarnDweller
15 Apr 2018
300 Blackout Sizing Die Problems
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I have been working up a load for my 300 Blackout Subsonic using Lee 230 Grain Bullet Mold (Powder Coated). I have not been able to get my groups under 2 inches and I could not duplicate a group the second time.
I checked for leading and there is none but I think I may have found the problem.
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