Home Forums Reloading Big Game Rifles RL 15 vs. RL 15.5

I have a Win. 70 in .35 Brown-Whelen, I've tried EVERY powder under the sun including the newer wonder powders.
This rifle likes RL 15 and I have quite a bit of it.
Is there much to be gained with RL 15.5 ? I'm interested primarily in 250 gr. bullets.
Also, finding RL 15.5 very hard to find.
Thank You

My experience with RL-15.5 in the .338 WM and .375 H&H is that I got higher velocities than with RL-15 and good accuracy. It's also supposed to be more temperature stable than RL-15 although I haven't done temperature testing. I did use it in hot weather in Africa and it worked great in those conditions.