I shoot a rather accurate M1917 in local matches and have owned several others. Mine seem to like 47 grains of Varget over a Sierra 150 grain FB FMJ. Brass is Greek HXP. I’ve used mostly CCI or Winchester large rifle primers. No pressure signs and the rifle groups very well. I always work my load up from 46.5 grains. Good luck the M1917 is one of my favorite mil surp to shoot.