I used load knowledge from Hodgdon and Accurate, but my to start with attempt yielded supersonic velocities. (At my spot the pace of audio was about 1,143 fps around the examination day.) Just after decreasing the powder charge, eight of the following ten rounds have been subsonic. Use load details https://300blackoutreloading21610.blogacep.com/30479855/the-definitive-guide-to-300-blackout-brass