The best loads I've shot in my 257 used IMR4350. However, RE 15 also shot good groups with 87 and 85 grain bullets (Hornady and CT's). I didn't chronograph those loads.
Thanks Bugger. I 4350 is on the list of powders to try if H 4350 and RL 19 don't pan out. Hybrid too if I need to.
