How do you guys manage your collections with respect to different calibers? Do you just have whatever guns tickle your fancy or do you try to limit the number of different calibers to make ammo logistics just a little easier? I got to thinking about my own collection the other night which includes .22, .223/5.56, .32, .357, 40, .45, and 12 ga. Now, mostly I only take a couple firearms up with me to do some target shooting and it's invariably either the AR-15 or HK USC (.45 cal) for a rifle, and the Walther P99 .40 cal pistol and/or the S&W 22A .22 pistol. I'll be taking up the recently acquired HK MP5-22 probably more often / in addition to the AR/USC simply because it's a fun rifle but shoots relatively cheap ammo. Anyways: Does it makes sense to hang on to firearms you don't fire that often anymore? Does it make sense to stick to a 2-3 calibers only to keep ammo purchases more streamlined? (not that I buy a lot of ammo)? Just curious on everyone's thoughts.