If one were to suggest the idea is fiction, you'd be saying all cartridges, regardless of neck length, shoulder angle, length, width, throat design, primer size, etc., are all equal. That none of that matters. I don't believe that. I just think other non-cartridge specific factors like the barrel, bolt, bedding, how it all aligns, and so on, makes enough of a difference that it becomes very difficult to know where accuracy is coming from, or what's preventing it on any given rifle. Having loaded for a handful of 6.5 Creedmoors, I believe that it is a good mousetrap. But one with a poor barrel, poor assembly, or whatever will not have the accuracy of countless other rifles in other cartridges that are well executed. There's significant overlap amongst most it seems.
