Shotgun Roundball Loads

[Erik Johnson]

I've got a Pedersoli 12 ga double and I'm working on developing an accurate roundball load for deer hunting. The gun has interchangable chokes so I put in two cylinder chokes. I've tried a .715 roundball with no patch (because a patch doesn't fit with this ball) in front of a fiber wad but accuracy is horrible. I've ordered some .69 cal balls and will endeavor to improve accuracy with a patch. I'm wondering what powder charge might be best.

Has anybody developed a roundball load for the 12 ga that is worthy of deer hunting out to 50 yards?

Also, I'm wondering if anybody has used a foster style slug in a muzzleloading shotgun with good results.