I have 5.5 inch S&W 625 JM. It shoots faster than my S&W 1955 6.5 inch. 200 grain Gold Dot does 1190 fps with 12.4 grains Blue Dot, 21,000 psi load. Speer HP 225 grain 11.6 grain Blue Dot 1027 fps. Hornady 250 XTP 10.8 grains Blue Dot 930 fps. 2400 works well but the crimp on jacketed bullets gives me fits too!