So, what is your caliber preference? LOL. I am leaning toward 40 cal. Probably because I have a bunch of G22s and a G27. I also have a Star pistol chambered in 40 cal. I like 45 acp though (G21 and several 1911s) and have several 9mm pistols and a good supply of ammo for both. I recon there aren't many "bad" pistol calibers. I stay away from 380 acp and 9X18, there just isn't enough power there. 22LR is to be used when you run out of everything else. 9mm is good range ammo. I use 40 cal and 45 acp for Car/HD. My G27 is my CCW.And we'll never have another chance to undo it!