I found a box of Hunters Supply 190 gr .38/.357 WFP cast bullets (.751” with crimp groove at .430”) today that I bought a few years ago, and stashed away because I couldn’t find a proper use for, and decided to load up some heavy .38 Special for my Henry with 9 gr IMR-4227 using 200 gr data from an old IMR 2001 annual Handloader’s Guide.
They felt pretty mild, and were dead-on accurate at 25 yards. I didn’t check the velocity because my new chronograph hasn’t arrived yet, so after I came in and put everything away, I ran a quick simulation on Gordon’s Reloading Tool. It predicted a velocity of a little over 1,200 FPS at just over 16,000 PSI from my 20” barrel. Somehow this just doesn’t sound right. What do you guys think? I know 4227 is a slow powder, but can it push that heavy a bullet to 1,200 FPS at standard pressure?