In my opinion the 280 was underloaded for the 740 Remington semi-auto - a rifle that I'd never own.

I feel the 280 can be loaded to the same pressure as the 270. My favorite load for my favorite 280 is 162 grain Hornady and 53 grains IMR-4350. There's no sign of over-pressure and I've reloaded some cases more than 10 times with no problem. That load shoots 5 shot sub-MOA.

I have some IMR4451 that I'll be toying with, but IMR-4350 is hard to walk away from.

I prefer classic.
Semper Fi
I used to run with the hare. Now I'm envious of the tortoise and I do my own stunts but rarely intentionally