Wow! I finally received my 375 brass from Starline today, & tried a few loads watching for pressure. AA-2015 Per factory email quotes 32.0 grains. The throat on this rifle is deep, & will take std. 38-55 brass no problem. Using the LEE 379-250 boolit PC'd & sized .378 I started a trial of 3 shot groups @ 31 grains of WC-846 (seems to be identical to AA-2015 burn rate with several different calibers I've tried) 31 gr gave me a 2 1/2 spread No pressure problems. Went up to 31.5 grs & wow four rounds @ 2-shot intervals trying to keep a cool bore. I got a .942 group with 3 touching tight & 1 slightly outside left. I know it's only 4-shots but I'm using a bevel based bullet @ about 1850 fps.Powder coated no check. Ran out of prepped brass & daylight, but called time out with hopeful thoughts for tomorrow. Sure wish Jess would get that 5-groove 38-55 completed. Hunt'n seasons comm'in.