Haven't tried RB's in the smooth bore yet. I will have to get a smaller mould. The .662 mould I have produces balls too large for the slight choke.

I may at some time, reduce the length of the barrels so I can use the .662's in plastic cases for the left tube, full sized balls and brass in the right - but hate to hurt the 'grouse' shooting capability with shot. Of course, with black powder shot loads, a cylinder will give good coverage to about 30 yards on birds.

I have some 7 1/2 shot loads made up for testing - if it would only warm up a bit- it's -20 this AM - with 30mph wind. Wind chill is below -30.