Do you know how many calibers you have?
Interesting question. Are you asking how many different calibers of ammo, or how many firearms chambered for a specific caliber?
If it’s firearms, this is a partial list of arms chambered for specific calibers. For example, I have a .22LR that also takes .22Long and .22Short. But that’s not three separate caliber firearms.
.17 HMR, .17 Mach 2, .22 Short; .22 Long, .22 Long Rifle, .22WMR, .22 Hornet, .221 Fireball, .223, .25 ACP, .32 ACP, .380 Auto, 9mm, .40 S&W, .38 S&W, .38 Special, .357 Magnum, .44 Magnum, .45ACP, .45 LC, .454 Casull, .460 S&W, 6.5CM, .30-06, .30 Carbine, .303 British, 7.5 French, 7.5 Swiss, .45-70, 6.5x55, 7.7 Japanese, 11x52R, 7mm Mauser, 8mm Mauser, 8x22 Nambu, 7.62x39, 5.45x39, .556, 7.62x54r, 8x56r, 7.62 Nagant, 7.62 Tokerev, 9x18 Mak, .50 AE, 10mm, .300 BO, .308, .358 NM, .410, 20ga, 12ga
Ammo? Oh man, don’t get me started, haha!!