As I understand it, the only way to improve on a .270 in a meaningful way on a 30-06 case is to go with the Gibbs. If I remember correctly it was one of Rocky's favorites, and the one he said benefited most from the "treatment". Trouble is, it's a giant PITA to form brass. Start with 30-06, form a false shoulder, neck to .270, blow it out, FL size...PITA
You'd be almost as well served by just necking down a 7x66 Vom Hofe, at which point you might as well have bought a .270 Weatherby. And if you're gonna do that, you've already missed the point about everything that's great about a .270.
