Reloading endeavor range report: Made it to the ranch and shot my progressive 375 WBY loads: Everything went great. No issues from my first ever handloads and the velocity numbers were a nice surprise. Success! There aren’t many published loads for 375 WBY, and those that are published seemed like they used faster burning powders than what would be optimal. I ended up trying a powder I thought might work well, but the closest cartridge it has published load data for is the 30-06. I extrapolated the 30-06 data to the 375 WBY. That might have been a little risky for my first attempt, but everything I read lead me to believe it would work fine. The last couple loads were compressed, and the bolt handle seemed just a little tighter when I opened it after the highest load (which I almost didn’t shoot because I was comfortably over my target velocity), which might indicate a little too much pressure. Here’s the data. Next I think I’m going to work up some loads around 2900 FPS and check grouping, then adjust from there if need be. Also need to shoot from the sticks and make sure the recoil hasn’t become ridiculous. Also, I used Caldwell’s phone ap, which is a handy way to automatically log the data, especially when you’re shooting groups: