I,m using Norma MRP in my Ruger M77, 338 Mag. My bullets are the 210gr Nosler Partition as a lot of those bullets came with

the rifle when I traded it for a 30/06 Ruger. I use 215 M primers and Federal or Hornady cases. Velocity is 3041 FPS. and is very accurate.

I would suggest you Try RL26 as it always works where MRP does usually goes a little faster.