My 280 AI loves Re23 under a 160 Accubond. 59 or 59.5 grains works well and nets me 2900 -2950 from a 24" barrel. I've run it to 60 gr under 160 gr but my rifle shoots better at 59 or 59.5. It's a toss up which is better.
I'd pontificate you could run 62 gr or so with 140ish gr bullet.
