Always been curious towards what my brass framed 1851 copy could push out. Havn't found any info saying what the possible muzzle velocities are. Only load the thing with 18-20 grains of powder since I don't want to stretch anything. Would load it with more but have been told to keep it around 20 if you want a brass frame to last. Can't imagine it's very fast the thing hardly dented the hub cap we were shooting at, unless I am underestimating the "squashiness" of round lead bullets hitting metal.