Hard rock
Well-Known Member
I built a 25-284 last yr with a 1-8 twist and first test with h4350 hit pressure around 3700 fps then moved on too Rl19 and made it too 3876 fps with my average vel of 3860 with no excessive pressure but back down too 61.2 grs from62 grs at 3800 fps . I still had room in the case with h4350 so moved too a little slower powder too get more burn in the barrel with a standard LR primer too give the powder a more even burn instead of peaking the pressure too soon and gained another 176 fps . A faster powder isn't always the answer with hammer bullets when you still have case capacity . Note my H4350 load was not compressed but my RL19 load was .Think rl26 will be to slow. H4350 was a recommendation from nosler. And it worked great. But as we all do I can't help but think rl16 being the next fastest powder that I should have tried that. Juts couldn't find starting data.