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Old January 26, 2013, 08:39 PM   #20
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Join Date: October 18, 2006
Posts: 6,215

Try upping the powder charge, if you are using a milspec primer you probably need to get closer to milspec pressures to make the primer cup fully expand into the cavity.

I've been using Wolf primers for a while now, and blow by hasn't been a problem with Lake City, PMC, Rem, or Winchester for me, using 24.4 grains of PowerPro 2000-MR which is slower than IMR4064. I would try 24 to 25 grains of 4064 under the 69 SMK.

Have you checked firing pin protrusion?

Machine guns are awesome until you have to carry one.
Jimro is offline  
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