if you're not a cop or a merc, you dont need a full sized pistol. I can react to the timer's beep, draw from under a shirt tail and put 2000 ft lbs onto the chest at 10 ft in 1.5 seconds, with a Sig P938, creating 8 wound tracks. The gun is 6"x 4.5", weighs 16 ozs. The major part of this is the choice of load. If you try to achieve this with a 230 gr .45, you can't get more than 5 wound tracks and 1800 ft lbs. and probably a lot less. My reloads offer 2 wound tracks per hit, 500 ft lbs per hit. The reaction, draw and hit being .95 second, or a hair less and the repeat hits averaging .18 second each. So a lot depends upon your skill level and the ammo chosen, not just size, weight, caliber of the gun.