If I were wealthy enough to own them all, my idea of "standardization" would be: slingshots with 3/8" steel and .44 lead, airguns in .177 and .22 pellet, firearms in .22lr, .32acp, .380acp, 9x18mak, .38spl, 9mm parabellum, .45 long colt, .45acp, .40s&w, .357mag, .22wmr, 5.45x39, 5.56x45, .243win, .30-30, 7.62x39, .270win, .45-70 gov, 7.5x55 swiss, 7.62x54r, .30-06, .410 bore, 20ga, 12ga and .44cal muzzle loader.