Subsonic 300 Blackout with IMR 4227 

Looking at 300 aac vids and found yours...good job. I plan on using VVN120 for subs but may have to give IMR a shot.

Awesome job. I love 300 Blackout, it's so much fun to load for.

Hi josh nice load I like your backyard range nice setup

Been running reloads with 4227 for 300 BO since about 2012 when I built my first 300 BO. It is awesome

I had great results with the 230 gr Lee also . They shot under an inch at 50 with CFEblk and 296 . I even milled the boat tail off of the mold to make a flat base and I think around 180 gr and they did even better groups . I prefer supers and haven't loaded many since those tests . Good video Josh . 👍

I don't know what to say about those water jugs, but MAN! That steel was sure dancing! Great shooting as always, my Brother!

most impressive! good work!

Hello Josh!! 4227 was the very first powder I chose for my 300 Blk loads and its served me well. It is best for 130 + weights but can work for all. My best ever group was with 4227 and a 150g Hornady 5 shots about .37".

IMR 4227 has worked best for me over other powders that I’ve tried (including CFE BLK, 1680, H110 and Li’l Gun) by far with that bullet. It shoots well for me in 3 different guns at 9.3 grains. Nice video, Josh!

Thanks well done

I'll have to try find some 4227 seems like works well

Nice

I know you using bolt gun here but I have a AR 16" and I'm trying to get Hornady 208gr bthp to cycle. using 4227 and go from 9.5 - 11.5, still not cycle the next round in. thinking about go higher on powder but not sure. anyone with any data that is working for them with similar bullet weight?

I hate to be a smart ass but after all they are "subsonic" I don't know your elevation but 1,300 fps things blow up. LOL LOL LOL