I’ve jumped on the .410 ban wagon and got all set up to load 3”. I was able to get cheddite halls and BP stretch wads.
My trial load is:
3” Cheddite halls - new primed
BPI stretch wad
278+ grains of 71/2 chilled
H110 - 14.7+/- .01 (had two at 15 grains)
Folded crimp 6 pt
Fired two for affect and safety in the backyard and noticed primers where dark in the firing pin divot they don’t but appear to be pierced. Fired a 3” federal #4 and no obvious discoloration of the primer.
Any thoughts on powder charge? To hot, to cold?
Edit note: fired four more from a 12 gauge with a 18” chezel adapter; no issues seen at all. Good close range pattern, primer appears normal. The first rounds where fired in an encore pistol. Maybe an issue with pistol?