The H Aston Model 1842 .54 Cal pistol was used by the US Army during the Mexican-American War of 1846 - 1848. However, it is my understanding that it remained in service through the first years of the Civil War (by both sides). I have a H Aston Model 1842 (manufactured in 1849) that I would like to try out at the shooting range. Does anyone know what type of real black powder is used (i.e. FFg or FFFg?) and what load in grains by volume is required (e.g. 25, 30, 35 grains by volume?).