The 280 is tough to beat! My 280’s liked the 154 grain Interlock, 162 grain Interlocks, and the 150 Partition the best.
One of my first 280’s was a 7x57 before a chambering reamer had its way with it. The best bullet in that 280 was a SPEER heavy Mag-tip - a great elk bullet. AAs I recall it was 160 grain???
The main powder I used in the 280 has been IMR 4350.
