When considering sub-compact barrrel lengths, do some rounds start to look better or worse than others. For example, since there is less barrel to burn up the powder, do the merits of a .357sig over a 9mm become lost as less time is allowed for the powder to burn. When using a sub-compact platform do lighter faster bullets or slower heavier bullets gain any more of an edge. Sorry if this is a repeat, but I couldn't find conclusive info on it. Wanna kill these ads? We can help!