I used MagPro, Norma MRP, and Ramshot Magnum before settling on RL26, which is now made from unobtainium. I shoot 168 TTSX over slightly less than a max load of RL 26 and Fed GM215M primers in Weatherby or Norma cases @ 3,280 fps if I recall correctly. Never a run-off or recovered bullet. If I exhaust my supply of 168 TTSX, I may switch to Barnes 175 LRX for a wee bit better BC.
I have been using Magnum in the 300 RUM with the 168 TTSX's as well. I am glad I tried it, accurate and excellent speed with that rifle and Magnum seems very available.
