I think certain things are just well matched with each other regardless of how they look on paper. In a light compact gun like a ruger american with a 22 inch barrel I would just rather have a 308 as a 30-06 just seams too much. In a heavier gun with a 26 inch barrel say a model 70 or a mauser I would rather have a 30-06. In a gun like that a short action cartridge just doesn't
Back on the same topic some guns just feel right with an older cartridge, like a sharps or the like. Would you want a 300 wsm sharps? Nah I'd rather have a 45-70 or 45-90. I am a bit of a handi rifle fan and I have tried 3 barrels in modern rimless cartridges and I don't like them as much as my 444. I know I posted earlier in this thread that I wasn't sure if I liked it but I have really come around to it in the last couple weeks shooting it. Even though the 444 is technically modern, I consider it to be effectively a 80% scale 45-70 which is just right in my short light gun.