I try to keep at least 100 loaded rounds on hand for each big game cartridge,1000 rounds for each varmint cartridge(.223 or22-250),the same for each AR-15. I have 1500 22mag,that's a little more then I intended to stock. 100 rounds for each of the pistols that don't see much use. I always keep 1000 45acp on hand,I shoot it at pins every Wed. Night. I shoot more 22lr than anything else and I'm starting to worry alittle, my stock is below 2000.
