So I have been working on reloading 300 blackout. I have come up with a very cheap plinking load that is subsonic, very quite and is fun to shoot. I bought brass from 300blackoutbrass.com. I have no affiliation with them and just happened upon them. I must say though this is some of the best converted black out brass I have used. The overall length varies slightly which can mess with your crimp consistency thus giving you vertical spread but again this is my plinking load. I am using palmetto projectiles, again no affiliation. These projos are awesome they are lead which makes them cheap BUT they are coated so they will not clog up your silencer or your gun. I am using accurate 1680 which is a little dirty but not awful. Mostly just residue in the lower that I can blow out with shop air when cleaning my gun. I am using this load on a 8.5 inch barrel with a average velocity of 1010 fps with a deviation so small I never have gotten one to go supersonic or even transonic. Very good for slamming steel plates suppressed so you can hear the ting or steal, all great for putting smiles on faces : ). I am loading this round for less than .35 a round brass included so once I start reusing the brass it will be about half that. So I am shooting subsonic blackout as cheap or cheaper than 5.56 I could'nt be happier. If any one would like this pet load pm me and I will divulge it. Took a lot of work and research but I have a winner here. I am so pleased with my hard work. Bolt holds open every time and it is consistent. The only downside so far is it being a lead projo you have to flare the case which means an extra step which slows you down. Obviously this is a pet load for my rifle but anyone could do the same. Can finally afford to really shoot this thing a lot now. Pictures to follow.