Alliant 4000-MR

[WDL]

I'm shooting the new Alliant 4000-MR in my 243 wssm with hBN coated 105 A-Max's. This powder seems to be leaving a lot of carbon in the throat area.
Anybody else burning this powder?
What is the cleanest burning powder in the RL-22 burn rate range?

 

[WDL]

Re: Alliant 4000-MR

bump