I decided to join the ever growing ranks of the 300AAC community. Once I looked into the cartridge and realized it required only the change of my 556 AR15 barrel, I decided to give it a try. Yes, all of the rifle is the same as the 556, only the barrel, muzzle device and ammo are different. Here I go over the steps required to convert 556 brass to 300 Black Out brass. Be sure and stop by my YouTube channel TexasNative00 where I post hunting videos.
I used a jig purchased off the web. The saw was just an inexpensive chop saw from Harbor Freight. If you want to get them both together as a setup ready to go you can find it on Amazon HERE. The jig basically holds the 556/223 brass in a position under the saw so that only the unwanted portion of the case is cut off. This leaves the bottom end of the brass long enough but not too long so that you can resize it using your 300 BO Dies. Once you resize the brass you will need to trim and deburr the case. After that, the case should be ready to load. When seating the bullets make sure to seat them at an OAL that will load in the magazines and feed properly. This will depend on the contour of the bullet you have chosen.
I've hunted with the 300 Blackout for multiple seasons now and from my own personal experiences, supersonic velocities are the way to go in order to get proper bullet expansion for a quick kill. I've shot many pigs with subsonic ammo and suppressor and it is really friggin cool to hunt that way. However, I might as well have been just poking holes in the pigs. Unless I hit bone, they ran like crazy and it required additional shots. Keep in mind that for us, hogs are considered a nuisance so we shoot them for control purposes only. Recovery of the meat is not in the plan. But for deer hunting with the 300BO, I use super sonic ammo. Here is a first person shooter (FPS) video of a nice 12 point shot with my super sonic 300 ammo.