I haven't seen much posted on any of the forums recently about using RL-26 in the 338 Win Mag so I thought I would share some results with everyone. I just finished a 2 day loading spree with my Blaser R8 caliber 338 Win Mag semi-weight 25.5" long barrel using RL-26. I tried 2 different bullets: Berger 250 Elite hunters and Hornady 270 ELD-X's. I've read that RL-26 is too slow for the 338 win mag and while it is a slow burn rate for this caliber here's a few things to note. Mine is a SAAMI chamber I'm assuming being that it is a brand new semi-weight barrel from Blaser 1 in 10" twist rate. I seated my bullets long, like .010-.030" off the lands for my testing so that I could get the adequate amount of RL-26 in the case to keep my right around 60,000-62,000 psi according to Quickloads. My best loads with the 250 Bergers I was loading 79 grains of RL-26 with a cartridge overall length of 3.614" and it was a little compressed I could tell but not too bad. That load was yielding 2,890 FPS average. The accuracy was either really good or not good at all, so I switched to the 270 ELD-X and that's when the magic happened. My cartridge overall length with the 270's is 3.531" (.007" off the lands in my rifle) loading 77.0 grains of RL-26 giving me a single digit ES speed of 2,745 FPS. According to quickloads it is only 103% compressed and is nearly spot on the velocity predictions. It is now shooting around .3 MOA groups at ranges out to 600 yards is as far as I've tested so far. No pressure signs whatsoever on any of the brass. Quickloads says I should be at 61,113 psi which is around 1,000 psi below SAAMI max for this cartridge. Now all that being said you can not get that much powder in the case of the 338 Win Mag unless your seating your bullets almost all the way to the lands. But if you do that then RL-26 can certainly turn the 338 Winchester Magnum into a potent long range elk cartridge for sure!