Hey guys,
I'm making up a few loads based on this data, but that being said, I have no idea how they will turn out, so use this at your own risk. (I'll also be testing with the string-and-sandbag method):
Starting load:
Win AA 2 3/4" hull
CCI 209 primer
38 grains Blue Dot
Rem RP12 wad/gas check (cut down because I don't need the "shot cup")
Wadding
580 grain (1 1/3oz) Slug
(roll crimped)
My "proof" load will be 42 grains of Blue Dot, creating around 11, 700psi (in theory), with speeds of just under 1400fps.
These loads are based on an Alliant reloading manual recipe, using a 1 1/4 ounce shot load, with a speed of 1330fps, and pressure of 10, 200psi.
As for the accuracy issue, I only care about hitting a 12" dinner plate at 30 yards, so if my loads will do that, then great.
Another thing a guy could test out is "paper patching" the slugs using teflon tape or masking tape, but you run the risk of increasing pressures depending on how much of a "seal" you get. And as I'm not trying for uber-accuracy with these loads, I don't think I will worry about that.