Although RR is calling their new engine the "RR300," it is on the same type certificate as the 250 series. Kind of the same thing as Hughes calling the 369 the "500." Just some differences is all. I've got tons and tons of hours logged underneath 250's, and I'd fly 'em to the ends of the earth. And back. And I know they'd get me both ways.
Now, the engine I'm flying behind is a big, round, belching, farting, roaring, noisy, uncorrelated 700 h.p. seven-cylinder beast, and I dearly miss my relatively quiet little RR 250 sewing machine. The things we do for a living
