You might be on to something Doom. I do find that the public ranges are over run with ARs and AR type "Black" rifles, but go to any Bench Rest Club and you will still see young and old guys AND gals, shooting bolt action rifles with loads made Exactly for the specific rifle. I stopped going to public ranges a long time ago.
I still shooting Short Range BR with a 6PPC
A 30 BR for Score short range and 300 yards,
A 6BR for 600
A .308 Palma and a 6.5x47 Lapua for 800/1,000
And they are all Bolt Action Custom Rifles, all with loads specifically tuned for each individual rifle.