I'm using a 210g. Lyman bullet mold, 50/50 ww and linotype. I'm using a .404 sizing die from Magma. My barrel slugged at .403. I'm using XMP 5744/21g. They crono at average 1500fps with a variance of about 20fps. I use polyester quilt badding/high loft (cut with a 40 caliber wad punch) over the powder somewhat loosely. The powder burns better, the accuracy is better, and the velocity is more consistant than without the filler. I'm using Lyman Alox/wax lube but am going to try some felix lube next. I am having a blast with this gun and I like the caliber. I've always been a 40 cal. fan. light recoil and accurate.