I have a .54. The real question is not "what's the maximum load", but "what powder chartge is required with a specific projectile to get the barrels to shoot close together"?? This is usually very different from a max load! Mine has a 1/66" twist, intended for round balls, but it will keep heavier bullets flying point-on, up to a point! For example, it will make a round hole at 100 yards with the 295-grain PowerBelt with 120 grains of Pyrodex RS. But the R & L holes are about 4" apart at 100 yards.
I have NOT tried to develop a "regulating load" with the PowerBelt bullet, but I did for the .535" PRB I chose for my "standard bullet". With 85 grains of Swiss FFg, it shoots like this at 100 yards, R - L, R - L:
I have not yet chronographed this load, but consider it
good enough for hunting deer and black bear.
The Kodiaks will stand charges much heavier than the ones you have to shoot if you want the barrels to shoot together!! :curse: I have a 2.5 X scope on mine. :thumbsup:
Iron sights are pretty useless to me these days - about all I can still use are big white beads up front, and wide shallow "British V's" on the back.