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Chick · February 17, 2013, 08:58 AM

Slamfire is telling you right. I have 3 M1As and I use the RCBS Competition die set, which Full Length resizes. I have never had to use a SB die set. NEVER use Bench Rest primers. The cup is too thin, and can result in a slam fire, due to the floating firing pin. Regular Winchester LR or CCI 200 will work fine. A friend did some accuracy testing with his, and used a chrono. He found that the velocity varied quite a bit more with the Winchester, but there was no difference in accuracy between the 2.

February 17, 2013, 08:58 AM	#39
Chick Senior Member Join Date: January 21, 2005 Location: Texas Posts: 140	Slamfire is telling you right. I have 3 M1As and I use the RCBS Competition die set, which Full Length resizes. I have never had to use a SB die set. NEVER use Bench Rest primers. The cup is too thin, and can result in a slam fire, due to the floating firing pin. Regular Winchester LR or CCI 200 will work fine. A friend did some accuracy testing with his, and used a chrono. He found that the velocity varied quite a bit more with the Winchester, but there was no difference in accuracy between the 2.