Originally Posted by Clarkm
I have got some extremely high chrono measurements without pressure sign with RL-17 back in 2010.
But researching the temperature stability of that powder, I realized it was nearly worthless to me for hunting.

I would try to get 3000 fps 140 gr NBT with IMR-4166 or IMR-4451, powders that are temp stable, low Copper fouling, and available.

Let us know how the 4451 and 4166 work out. Happy Trails

Life Member NRA, RMEF, American Legion, MAGA. Not necessarily in that order.