I don't think anyone has used a .308 Winchester in BR matches (group) for decades. Lord only knows what they used back then. Even Hunter BR (score) shooters rarely use a .308, and when they do, it's usually with very light (130-ish gr) projectiles in a very slow twist relative to what most common .308s use - so the results don't exactly relate to anything you might have handy.
That said... AA2520 used to get used by some folks in the .308 when the M1A was still popular for High Power Rifle matches... like a decade or so ago. Pluses were that it meters very well, being a fine ball powder. Minuses include being a ball powder and somewhat temp sensitive as a result, and from what I've heard, massive variations between lots, as people have reported finding 8# jugs of 2520 manufactured in several different countries. Not first hand information, so take it for what its worth.
Will it work? Sure. Would it be my first choice? No. Varget or RE-15 would fill that slot. If I were inclined towards a ball powder, Ramshot TAC does pretty well for some.