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Old January 26, 2013, 08:39 PM   #20
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Join Date: October 18, 2006
Posts: 6,147

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?

Jimro is offline  
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