Is 10mm really better than .357 Magnum?? I've been noticing a lot of discussion on this subject and a lot of claims as to the superior abilities of the hallowed 10mm round for use against large and dangerous wildlife. The claims that the 10mm is wholly superior to the .357 magnum inspired me to do a bit of research on the subject. I've collected information from Buffalo Bore, Underwood, and DoubleTap, since these three are big players in the hunting ammo arena. I haven't been able to find any ballistics info for a 6” barrel magnum revolver, but the ballistic info for the S&W Model 27 will give some idea of what kind of velocities could be expected from a slightly longer barrel. Here's what I was able to find: 357 Magnum: Buffalo Bore 180gr LFN: Advertised - 1400 fps/783 ft lbs S&W Model 27 (5” bbl) – 1398 fps/781 ft lbs (Taken from BB website) Buffalo Bore 158gr JHP: Advertised – 1475 fps/763 ft lbs S&W Model 27 (5” bbl) – 1457 fps/745 ft lbs (Taken from BB website) Underwood 180gr LFN: Advertised – 1400 fps/783 ft lbs 10 mm: Buffalo Bore 220gr LFN: Advertised – 1200 fps/703 ft lbs G20 (4.6” bbl) – 1140 fps/635 ft lbs (Taken from BB website) Buffalo Bore 200gr FMJ: Advertised – 1200 fps/639 ft lbs G20 (4.6” bbl) – 1198 fps/637 ft lbs (Taken from BB website) Buffalo Bore 180gr JHP: Advertised – 1350 fps/728 ft lbs G20 (4.6” bbl) – 1331 fps/708 ft lbs (Taken from BB website) Underwood 220gr LFN: Advertised – 1200 fps/703 ft lbs Underwood 200gr LFN: Advertised – 1250 fps/694 ft lbs Underwood 180gr XTP: Advertised – 1300 fps/676 ft lbs DoubleTap 230gr LFN: Advertised – 1120 fps/641 ft lbs DoubleTap 200gr LFN: Advertised – 1300 fps/750 ft lbs (**Close or equal to .357 ballistics) DoubleTap 180gr JHP: Advertised – 1305 fps/681 ft lbs Since I have a 6” barrel .357 handgun, I decided to look for reviews and ballistic information for the G40, since it has a 6.02” barrel, which should provide better ballistics than the G20's 4.6” barrel. I attached links to the websites that reviewed the G40: G40 (6.02” bbl): Buffalo Bore 180gr JHP: 1445 fps/834 ft lbs (**Exceeds .357 ballistics) http://www.sadefensejournal.com/wp/?p=3604 Sig Elite 180gr FMJ: 1239 fps/614 ft lbs Fed Vital Shok 180gr JSP: 1319 fps/695 ft lbs https://www.americanhunter.org/articles/2016/2/19/hardware-glock-g40-gen4-mos/ Fed Trophy Bond 180gr: 1289 fps/664 ft lbs https://www.americanrifleman.org/articles/2015/12/17/review-glock-g40-gen4-mos-pistol/ So there it is. From what I can see, there are only a couple of commercial options that will allow the 10mm to best a .357 magnum, even when using the G40 Glock. Based on what I can see, the .357 looks like the winner in the “Higher-Energy on Target” race. So, are the “alleged” higher 10mm velocities coming from those who make their own special handloads? Is that the answer or is there something else that I'm missing?