For bullets, use any .308 diameter bullet. Some makers, such as Barnes, are developing purpose engineered bullets specifically for the velocities of the 300 BLK.
Nifty, that makes things easy.
For brass, you can trim and size .223 Remington/5.56 brass. New Remington brass is available. I think Allen Arms has some currently.
New brass works best for me, thanks.
Lee, Redding, Hornady, Foster (maybe others) have 300 BLK dies available.
If Lee has it, all good - my "go-to" dies.
If you're loading on a Dillon progressive, you'll need the "AK47" powder funnel due to the lack of case length like the x39.
Nope, 30 year old RCBS RS single stage with Uniflow powder measure, anticipate no problems
Lead is no problem. Be sure to slug your bore like any other.
Well, if any .308 will fit, there's more than one mold to choose from!
If you like kinetic energy, the 300 BLK has almost 17% more energy at 300m than the x39. It also feeds much better than the x39, which needs curved magazines.
Sweet - but does it drop like 7.62x39mm? I can't really reach out very far with my CZ 527M, as much as I love it, with that rainbow trajectory. Does this shoot flatter/farther?
In general, most any .223/5.56 weapon platform can be converted to 300 BLK with a simple barrel change. A friend of mine is working on converting his Mini-14 to 300 BLK. The rounds fit and feed manually from the magazine (he took his barrel off).
Again, nifty - any other firearms available STOCK in this caliber other than AR clones? I just really hate that SPROING in my ear, unless they designed that out in the 30 years since I shot an M-16. The whole concept really does appeal, don't get me wrong. Thank you for the detailed answer.