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I have 2 loads that after over a year & some modification to my Pietta 1858 NMA with it's 5.5" barrel that shoots quite well out of it.
Bullet = .457 143 grain Cast Round Ball .065 BC.
Powder = Goex FFFg black powder.
Primer = Remington #11
Lubed wads.
5-1/2” Barrel Average Ballistics.
22gr. Volume = 642 fps. 130 ft. Lbs.
Very accurate out to 30 yards "that I've tried" averaging about 2" grouping, just have to aim high because of the sight set up for the next load.
Bullet = .456 220 grain Cast Lee conical bullet .138 BC.
Powder = Goex FFFg black powder.
Primer = Remington #11
5-1/2” Barrel Average Ballistics.
30gr. Volume = 702 fps. 240 ft. lbs.
Decent accuracy averaging 3 - 3.5 inch groups at 30 yards but is a hard hitter for coyotes & what ever else.
I have 2 other 1858's & a 1860 & yes Pietta is very conservative in their propellent ammount, but from my experience these pistols like the real black Powder the most in the accuracy department but will shoot Pyrodex P quite well too, unless you really need to I would avoid using 777 because it is quite finiky on how much compression you put on the powder when you seat the bullet compared to Pyrodex or Black.
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