My experience with the .280 Rem and it's Improved cousin the .280 AI go back about thirty years. My rifles were all Hunters, not target guns.
Still have a 24" Light Weight bolt gun, capable of 1/2" for four shots at 100 yds and usually sub 1" at 200 yds...with Nolser 150 or 160 gr PARTITIONS. and NP's are not exactly Match bullets. Simply a good barrel and a properly bedded action in a stable HS Precision stock. My crono data shows I avg 2950 for 150's and 2850 for 160 gr bullets.
My oldest is my original, once rebarreled Rem 700. Always been a 26" gun, Originally a Douglas with a #3 taper . now a HART with the same taper. That ones in an old Brown , glass stock, pillar bedded and Timney trigger.
May simply be a "fast" barrel or two inches DO make a difference, but I avg 3050 for 150's and 2950 for 160's.
I've hunted a lot of game, most of it between 200 and 400 yds with both guns. And I finished probably a dozen wounded animals with these guns, a few at over 500 yds , back when I Guided hunters. The .280 Rem has never let me down.
I've also got another Rem 700 with a 26" Hart that my Smith AI'd for me several years back. Added maybe 100 fps to my previous loads, but didn't see much of an accuracy difference. that gun shot well when I got it back from Harts, it still shoots well.
My only issue with the AI is fireforming brass. IF you need a large quantity. I have 60 rds as it's purely a hunting gun. I recently thought of using it for a LR shoot with some friends and by the time I bought 100 rds of new Rem or Win .280 brass, THEN fireformed, then loaded it all AGAIN...I gave up on the idea. YMMV and MY issue is one of not having the TIME or components right now to blow a hundred rds downrange, then reload again. Probably a personal glitch of my own.
I like the .280 AI as it's a sexy looking cartridge, it does add another 100 fps and cases do NOT seem to grow much at all. I'm still loading my original 50 or 60 cases , some with 5 and 6 loadings already.
All that said....one of my favorite cartridges is the 7mm-08 Remington. I've suggested it to many hunters over the years and it's what my wife hunts with. She has cleanly killed several elk with 150 or 160 NP's at a leisurely 2400 -2500 fps.
To me the .280 Rem is just a little bit BETTER. Capable of shooting heavier bullets and reaching out farther.
Do some research into the .280 Rem. You may be surprised how many fans it has. For what ever reason the MAJORITY of hi end Custom rifles are chambered in .280 Rem. Or at least thats the stat I read a few years ago. A very popular cartridge with the Custom builders.
Sorry that my experience is with hunting and not Matches....but DO take a closer look at the .280 Rem and the AI.
A wounded bull finished with a single shot at 555 yds, std .280 Rem, 160 NP. I'd never normally shoot at that distance. The hunters Burris scope was off and he gut shot this guy twice at 80 yds. Closest shot We had before it got too dark. He was going to use my rifle, then at the last minute asked me to finish it. Simply posting to show It can deliver some good LR accuracy.
FN in MT