...most pistol calibers run out of steam by about 16"...
Most pistol calibers loaded with most pistol powders will run out of steam in a 16" barrel. Both the .44/40 & .38/40 can be loaded to impressive velocities using Reloader 7 (check Alliant's 2004 pamphlet with reloading data on it). I would expect that a similar work-up for .44 Mag or .45 Colt may yield gratifying results. I doubt that they'd give stellar performance in a revolver, but that's not really the point.
AA 1680, AA 2015, VV N130, or either of the 4198s would probably work.


