Does anyone load subsonic .300 blackout rounds using the 200 grain, .308 expanding subsonic bullets from Maker Bullets? A friend of mine is just starting to reload and trying to find load data for the above bullet. The manuals he has does not have sub loads. Most of what I have found is for super sonic rounds.
Are there any particular reloading manuals that specialize in sub sonic loads?
Are there any particular reloading manuals that specialize in sub sonic loads?