I've got Retumbo, H1000, Magpro and RE 25 sitting here... I'll get working on a load here soon. Until then I'm gonna dream about the A-Bolt .270 I may someday own....
Bore... I've shot more than a little bit of .525 BC at 2900-3000 fps... though it was in a .260. And I know for a fact that on blustery days, it's easier to make hits with a .600+ BC at those same velocities... to the tune of about a third more first round hits. Easy as that.
Not sure where the formula for empirical evidence is on the Excel Spreadsheet....