Have not shot the A frames, but lots of Nosler partition and Accubonds 260 gr.
I load RL17 to near max- 2800+ from my 20" Alaskan.
270 Speers shoot well with RL17 as well.
270 grain Barnes TSX, 81 grains H4831, Fed 215 Primer, Ruger Cases. 2700 fps from the 20" barrel, shoots .3", 3 shot groups at 100. Same loads should work just fine with the Swift A Frame bullets as it is 4 grains below published max.