Marco Califo
New member
I am seeing SP Magnum primers available. Question is can I substitute these for regular SP and adjust powder down say 5%?
This is for 9mm and 40 SW.
This is for 9mm and 40 SW.
I would be using these with suitable performance pistol powders (BE-86, CFE-Pistol, AutoComp, Unique, Power Pistol and Longshot.With Unique I bet the difference would be too small to measure.
Unclenick,Go for it. just seat them very firmly to maximize sensitivity. If you have a chronograph, check velocity for charge adjustment purposes. In some instances, the magnum primer will actually produce lower velocity because it is unseating the bullet before the powder has burned enough to do it.