View Single Post
Old January 26, 2013, 08:39 PM   #20
Jimro
Senior Member
 
Join Date: October 18, 2006
Posts: 5,761
Oldandslow,

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
__________________
"Gorsh" said Goofy as secondary explosions racked the beaten zone, "Did I do that?"

http://randomthoughtsandguns.blogspot.com/
Jimro is offline  
 
Page generated in 0.04139 seconds with 7 queries