Coot,
I have an A & H percussion model Mountian Rifle and just love it. With the 1/28 barrel it is a superb shooter using saboted or conical bullets. my pet load is 110 grains of 777 under a 250 gr Barnes Muzzleloading bullet. It will consistently cloverleaf this load 1 1/2 inches high at 100 yards. I have taken 4 deer, 6 hogs and an antelope with this combo. Happy shooting and good hunting!