The 400 Corbon is a 45 ACP necked down to 40 Cal, get about the same performance from it that you do with the 10mm, puls the grip isn't too big for my hand in the XD-45 Tactical.
Also notice the ft pounds.
400 Cor-Bon Corbon Factory Ballistics
135 GR. JHP 1450FPS/630FTLBS
150 GR. JHP 1350FPS/607FTLBS
165 GR. JHP 1300FPS/619FTLBS
10MMCorbon Factory Ballistics
135 GR. JHP 1400FPS/588FTLBS
150 GR. JHP 1325FPS/585FTLBS
165 GR. JHP 1250FPS/537FTLBS
