The .222 magnum is really about the only cartridge that pops to mind as having once been king of the hill and now just about unheard of. Yet folks took it,necked down to make 204 Ruger... And then neck said 204ruger back up to .224 and suddenly it's a great new thing again lol. The 7mm mag isn't going away any time soon. Unless of course projectiles makers pull head out of arse and make a few more decent BC .277 calibre offerings and rifle makers put some faster twist barrels of said .277 size on rifles,it might be in trouble then,still won't disappear overnight lol.
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