as i said...thats the bottom end of things....so maybe...it does make difference if trying to go subsonic..a magnum primer was worth close to 2 grns of trail boss EG load would crack unless dropped 2 more grains of powder....
ap70 LOAD IS BULKY so shouldnt need a filler UNIQUE is in same boat....in a big case,maybe an issue,maybe not.std primers worked well for me with the lighter loads,but magnum still went bang....
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