You are right on this one! We think alike.
One Caliber, fits every pistol "all same mfg", every magazine. Pistols. 9mm.
One Caliber, fits every rifle, "different mfg's", every magazine. Rifles 223/556.
One Caliber, fits every shotgun, "different mfg's", Shotguns 12 gauge.
One Caliber, fits every rifle, "different mfg's", 22 long rifle.
One Caliber, fits every rifle, "same mfg's". 30-30
That is all.
Rick, you only buy one manufacturer of handgun ammo? Can you tell us what brought you to that decision? I've not had great luck with UMC in my wife's Smith 9mm, but I recently cleaned the crud out and am going to try it again... that's the only brand-specific problem I can remember running into (that damn Walther P22 aside!! lol).