I've run out of SPP, but I do have SMPP
I'm using Power Pistol powder under a powder coated 125gr Lead conical nose bullet (Missouri Bullet).
Lyman Cast Bullet handbook shows 5.0gr - 5.5gr as the charge range (with standard SPP, of course).
I did a workup starting at 4.5gr. at 4.7gr there was pronounced primer flattening, but even 4.5 was pretty energetic.
So, I dropped it down to 4.3 and tried that. The slide locked back, so it seems good. I still think the primer is flattening, but I'm wondering if that is simply because the energetic ignition of the magnum primer is flattening itself on the breech face?
Should I keep testing lower charges to find the lower limit where the gun won't run?
I'm using Power Pistol powder under a powder coated 125gr Lead conical nose bullet (Missouri Bullet).
Lyman Cast Bullet handbook shows 5.0gr - 5.5gr as the charge range (with standard SPP, of course).
I did a workup starting at 4.5gr. at 4.7gr there was pronounced primer flattening, but even 4.5 was pretty energetic.
So, I dropped it down to 4.3 and tried that. The slide locked back, so it seems good. I still think the primer is flattening, but I'm wondering if that is simply because the energetic ignition of the magnum primer is flattening itself on the breech face?
Should I keep testing lower charges to find the lower limit where the gun won't run?