Can someone please tell me why certain, or all, calibres of rifles have a brand name after them?

Question

ok, i don't know if what i'm asking makes sense, but i'll show you what i mean. When looking at rifles and stuff in magazines and so on it might have that a certain rifle is available in .204 ruger or .223Rem or .308Win or something like that. I just wanna know what the little end bit (eg. Ruger, Rem, Win) means. Not that it stands for Remington or Winchester or anything cause i know that, but why it is there and what it means about the calibre of rifle. Even with .22WMR and .17HMR; why are they Winchester and Hornady Magnum Rimfire and not just Magnum Rimfire. I don't get it. Please enlighten me.

Answer 1

When you see the brand name after the calibre marking it just certifies that that particular calibre is owned and origionaly produced by that manufacturer. For example 223 Rem is a Remington calibre and 243 Win is a Winchester calibre basicly the individual owns the rights for that calibre.