You don't want to compress T7 so you can't get much more than 30-35grs in a 1858. That's not going to hurt it. Guys shoot full chambers of T7 in Walkers, that's 60grs+/-.
This well not be the most accurate load you can shoot. My experience is with full chambers you don't burn all the powder before the rb has left the barrel.
back in the day I used 30 gr pellets,won wad, buffalo boolit harder to ignite than 777,depending on your gun ,you should not exceed the recomended load,the r o a has a published limit of alll the blk powder you can fit inn it,get u one.
I hunt in Florida with an 1858 Pietta stainless steel bison revolver with a 12 inch barrel. My hunting load is 35 gr of 777, a wad and a .454 ball. This load chronographs out of my 12 inch barrel at a very conservative 1200fps / 450lbs. Last season I harvested a 65 lb wild boar and it was a one shot instant kill at 30 yards. I have shot up to 40 gr of 777 with a massive increase in velocity and energy with no ill effect to gun or shooter but the accuracy diminishes to unacceptable hunting levels. These loads were above the max recommended loads but were safe in my gun. I stress do not exceed your manufacturer's max load! DO NOT TRY THIS LOAD ON A BRASS FRAME COLT OR REMINGTON!!! FRAME DAMAGE MAY OCCUR! 777 is powerful stuff treat it with respect!
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