Ignore this thread. I have re-tested and posted new data Here: http://www.glocktalk.com/forums/showthread.php?p=20420559#post20420559 I've been very "big bullet" oriented, content to carry a 45 either 6 + 1 or 7 + 1 (Glock 36 or 1911). However, I can envision the possibility of more ammo capacity being beneficial. The potential of making quick accurate follow up shots must also be taken into consideration. I've decided that a "compromise" may be best, a compromise between capacity and caliber, but not KE or control. How can I have the most KE and capacity with the least recoil? 10mm and 357 SIG. Examples: There is only 1 round of capacity difference in these pistols: Glock 26 Ranger T 127 gr. +P+ @ 1,182 fps / 394# KE / PF 150 Glock 27 Ranger T 165 gr. @ 1,071 fps / 420# KE / PF 177 Glock 33 Ranger T 125 gr. @ 1,280 fps / 454# KE / PF 160 There is 3 rounds (I can't cram the last round into the 10mm magazine) capacity difference in these pistols: Glock 36 Ranger T 230 gr. @ 874 fps / 390# KE / PF 201 Glock 29SF Hornady 155 gr. @ 1,278 fps / 562# KE / PF 198 There is 6 rounds capacity difference in these pistols (7 round Tripp mag in the Valor): Dan Wesson Valor 230 gr. Ranger T @ 928 fps / 440# KE / PF 213 Glock 32 Ranger T 125 gr. @ 1,340 fps / 499# KE / PF 168 These two pistols are different so the PF calculation is not as direct; however, subjectively the 32 doesn't produce any more felt recoil than the 1911 (blast is a different issue). PF = power factor and the calculation can be used to compare recoil out of similar pistols. The niche calibers 357 Sig and 10mm offer the greatest power with good capacity and comparatively moderate recoil, at the expense of greatest capacity or diameter. Preemptive dismissal before any replies about ammo cost, this is about performance.