27 grs of FFF Blackpowder.
A typical starting load for the ball and cap Leinad pistol would be about 15 grains of fffG powder.
How much is a old black powder only 45 cal long barrel pistol worth?
Depends on the caliber. A .45 caliber pistol uses about 40 grains of black powder. Contact the maker's website and download the owner's manual for YOUR gun.
Follow the recommendations in the owner's manual.
First, find a copy of the owner's manual for YOUR pistol. Second, use ONLY black powder, or a modern black powder substitute, such as Pyrodex. The ROUGH rule of thumb is one half the bore diameter in grains of powder. A .32 cal would use ABOUT 12-16 grains of powder.
10-100 usd
40 grains of fffG
Chances are that if you overload the charge in a revolver style black powder pistol, you can blow up the cylinder or blow the barrel off the end of the gun.
twice the caliper plus 2 or 67 max
Assuming you have a single shot ball and cap black powder pistol, anywhere from $50 to $100. These are modern manufacture reproductions, and relatively cheap.
fill it all the way up get 1000 fps no worry about blowing up
150 to 2500 dollars all depends on what kind of weapon you want.