Bringing this interesting thread up again.

I many of you know I have a Rigby Shot & Ball gun which seems to have sqeezebore or chokebored barrels where the barrelwalls seems to have 3 "grooves". The barrel dia starts out with aprox. .743" and ends up in .735. I have tried with Blue dot powder and a .735" roundball. That combination could make anyone make a run after the balls as they came out of the barrels. Some actually landed down on my feet more or less..:LOL

I have a .750" roundball mold actually. Would it be safe to fire softlead balls of that caliber in such a gun taking I use FFg Blackpowder perhaps?. I have thought of ordering a .744" RB mold but just wondered if it were safe enough to fire soft .750" RB in my gun.