Thread: Reloading 300 BLK

If everything goes well, by the end of this week I will have a .300 BCK upper I will pick up from TNT Weaponry at the Expo Center and most reloading tools and components.

1. Seems that AA1680 is the favorite propellant for sub-sonic loads, but I do not have any. Who carries it locally? Any vendor who frequents the PDX gun shows?

2. If I can't get any AA1680, what about AA5744 as a plan B? I have a 2-3 lb of AA5744 (extruded), a bit faster and bulkier than AA1680 (ball). Has anyone tried it with 220gr SMK? Me thinks it should work fine on a pistol length gas system.

3. I’d like to experiment with .309 cal 200-240gr cast bullets. Problem is, I don’t do cast and have no intentions to take up yet another hobby. Does anyone know who has them? I know of a couple of vendors who have gas checked bullets which are almost as expensive as match jacketed bullets. That’s not what I want. I am looking for the typical bullet used for .30-06 at under 1800fps that can feed reliably on the AR platform.

I too use 1680. Here is lots of SS load data http://www.quarterbore.com/300whisper/subsonic.html

Are you planning on running a silencer with it? If so I would stay away from lead bullets.

AA1680 is the way to go for sure, Wholesale Sports (the old Sportsman's Warehouse) stocks it for abour $20 a pound. 11.5 grs with a 220 gr SMK does the job at about 1050 FPS from my 16" BBL.

Originally Posted by Nwcid

Are you planning on running a silencer with it? If so I would stay away from lead bullets.

That depends on a number of things. I already do it on a different rig. No issues so far.

So, if you know of any .309 cal 200-240gr cast bullets for sale.

1680 is a good powder. The quarterbore site has a lot of good info, as posted above.

H110 is the only powder I use for the 300blk aka 300/221 aka 300 fireball aka 300 whisper. For supersonic or subsonic loads it is hard to beat.