Daryl S
Yes the slug master has a fully rifled barrel. I do not know what the twist is. Last night I fired three shots made up in Brass 12 bore cases, 150 grains of fff black powder, card wad, two felt wads and a 570 grain ball. Fired at 40 yards I had 3 large holes in a triangular formation in about 2". It is great to shoot these loads. There was a metal swinging target begind my target boar and the 5" round plate was about 3/8 thick. One of the balls hit it after going through the target. It actually knocked the stand over. Very spectacular though all the smoke. I will chrongraph these loads and it might give me a indication of what velocity works.
Next is to try some parodox slugs when I get my Mould.

Thanks for you help.