.40 was one of those instances where I had access to an abundance of ammo and needed something to shoot it in. The organization that I worked for provided me with a significant amount of .40 caliber ammo, even after I gave away 4,500 rounds to coworkers, I probably still have 7,000 to 8,000 rounds of factory ammo. I ended up with a Glock 23, Glock 27, HK USP.Compact, a Kimber Custom II, a Ruger PC4 and a Ruger Vaquero, all chambered in .40. I was afraid I'd wear it out if I only had one.