10-1000 USD depending on specifics.
How much is a old black powder only 45 cal long barrel pistol worth?
50-250 USD
10 USD or so
10-100 usd
Dikar Spain-45 Cal black powder only
Either FFFg black powder or Pyrodex P may be used.
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.
50-100 USD
Follow the recommendations in the owner's manual.
I would suggest, the value of the weapon talked about would be what the market would bear.
Recently sold mine for $125 and a 50 rounds of 38 special. it was in excellent condition.
50-300 usd