To answer the OPs question, no I don't think so.
Greetings,
To quote the words of Mark Twain I think it was:
"News of my death has been greatly exaggerated"
Foretelling the death of a cartridge still being chambered by most is premature ant least and likely foolhardy. Many have forecast the immediate death of cartridges due to some perceived, fault often promoting their favoured alternative, only be ignored by the vast majority of the rifle buying public. As has been said before the purchase of a new rifle is often not a venture where cool headed reason prevails.
Regards Grandpamac.
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.
75/15/10 black powder matters
In terms of being able to totally maximise the performance of the 7mm RMs a large percentage of factory rifle offerings have certainly fallen short of the benchmark when considering the performance that one can achieve with a custom action and chambering.
Seating depth being the main culprit in Tikkas for example.
In time, a factory PRC will achieve this bench mark and probably exceed it in a cheaper factory offering and that will absolutely kill the RM.
The RM’s belt also gets a bad rep even though it’s a complete non issue if sized and loaded correctly.
Will the average PRC match the performance of my own custom 7mmRM, possibly not but it will be close enough and a hell of a lot cheaper and easier to get there.
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