yea the 10mm beats that round hands down when it comes to numbers
.50 GI
Bullet weight/type Velocity Energy
185 gr (12.0 g) SCHP 1,200 ft/s (370 m/s) 591 ft·lbf (801 J)
230 gr (15 g) SCHP 1,000 ft/s (300 m/s) 510 ft·lbf (690 J)
275 gr (17.8 g) JHP 875 ft/s (267 m/s) 468 ft·lbf (635 J)
300 gr (19 g) TMJ 700 ft/s (210 m/s) 326 ft·lbf (442 J)
10mm
Bullet weight/type Velocity Energy
150 gr (9.7 g) Nosler JHP 1,475 ft/s (450 m/s) 725 ft·lbf (983 J)
165 gr (10.7 g) Golden Saber HP 1,425 ft/s (434 m/s) 744 ft·lbf (1,009 J)
180 gr (12 g) Hornady XTP 1,350 ft/s (410 m/s) 728 ft·lbf (987 J)
200 gr (13 g) WFNGC HC 1,300 ft/s (400 m/s) 750 ft·lbf (1,020 J)
230 gr (15 g) WFNGC HC 1,120 ft/s (340 m/s) 641 ft·lbf (869 J)
the only thing the 'fiddy' has going for it is that people will hear ".50 cal" and go "ooooooooohhhhhhhhhhh"