I know I posted on here about picking up some 410 brass shot shells from Magtech. Anyways, loaded some up with 13.5 grs W296, 3 over powder corrugated cardboard cards (7/16" I think, would have to double check), and 11/16 oz of #7.5 shot, than another over shot card, and Elmer's glue. Shot column is probably close to 1/4" below mouth, so there is room. Anyways, finally shot 5 rounds today, and all went off fine; But, I noticed 2 of the 5 seemed quite, and less recoil, and their appeared to be some unburnt powder residue in barrel after 5 shots.
So, question; is that a lack of good gas seal, not compressed enough, not sealed tight enough to build pressure? If it is, being that I'm working with the odd OD of brass 410; any suggestion, to get a consistent ignition?
It seemed like at 25 yards, there where some pretty big voids in pattern, but at 15 yards, it consistently covers a domino's medium pizza with shot. Is shot pattern kinda just a bit out of your control without a real shot cup?
Intent is mostly squirrels, rabbits, (guessing rabbits at max 15, squirrels maybe 25, and snakes within 5). Partly this is just messing around, cause I can, beyond just cheaper or better then factory; but availability of anything larger than 1/2 oz of #8 is another reason.
I should mention, I reload multiple metallic; but not shotgun;
