450- I'd expect there are some powders available to you in the similar burning rate as our 4756 is.
: This powder allows for 8,000LUP loads with 1-1/4 ounces of shot. That's where I started. The wads and ball produce less friction in the bore (I believe) than a round ball, so I was able to increase the charges a bit, chronographing all the way, stopping at 1,550fps. with the 545gr. ball.
: When we get our barrels rifled, I expect to have Jeff Tanner make me the right sized ball.
: Friends of mine used undersized balls at 684" and 466gr. cast in wheelweights with cloth patches in their 12 bore full choked guns. These which 5"groups at 50 yards, double beads only for sights. This loading was used on several big bull moose, with good effect, while duck hunting.
; It may be possible to reduce pressure and gain accuracy without any leading by experimenting with slightly undersize balls and patchse as they did. I'd personally expect 2" groups at 50 yards, maybe better, especially with sights.
: Good luck on the hogs.
: 1,300 fps with 700gr. balls sounds great Bob.