Another little secret: One can neck down 30-06 cases to .270 Winchester.
First time you do that, the case length is a few thousandths of an inch short. But I was using good ol’ Lake City military brass, and shooting in a bolt-action. The brass would stretch to normal .270 Winchester length after one or two uses.
I didn’t worry much about case separation, as military brass is thicker than commercial brass to start.
I miss shooting my Whelen, it NEVER FAILED TO BE THE LOUDEST RIFLE, on the shooting line at the gun ranges I use to visit, back in Long Island, New York. Islip shooting range (50 yards only) and Brookhaven shooting range (100 yard.) Between the SOUND and the MUZZLE FLASH, in day light no less, it was quite the rifle.