The Firing Line Forums - View Single Post - 223 primer blow-by?

Jimro · January 26, 2013, 08:39 PM

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

January 26, 2013, 08:39 PM	#20
Jimro Senior Member Join Date: October 18, 2006 Posts: 7,097	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 __________________ Machine guns are awesome until you have to carry one.