Does anyone have any experience with this powder? Due to the recent shortages I am running out of h1000 and need an alternative. I recently found 8lbs of 4000MR in stock so I bought it. I have other calibers that this should work well with but was wondering what your thoughts on using it for Lapua AI are? On their website Alliant has loads listed for 300 RUM, 200 gr Speer SP, 81.4 gr 4000 MR @ 2950 fps.