I reloaded my .270 WSM with IMR4831 with excellent results. It shot sub MOA groups from 65 to 66.5 grains of powder. I loaded 1/2 grain increments

I also use the Retumbo for my 7mmRUM, 97.5 grains shoots well. AR25 produced the highest velocity and MagPro produced the lowest of the three powders I tested. I ended up going with the Retumbo and a Barnes TSX in 140 gr. bullet.