My 257 Roberts model 70 24 inch with 115gr Nosler partitions, likes RL17, RL23, Norma MRP and RL26. The last 3 give over 3100 FPS.

I do think my barrel is fast. Mostly I shoot RL23 as it is temperature stable and very accurate. RL26 will give 75 to 100 fps more but a little less accurate.

MRP is in-between a little faster than RL23 and a little more accurate. But not temperature stable.