Take a 6.8 brass and run it into a 30 Herrett die and then trim neck. Brass is ready to load.

I ran across this back sometime last year actually looking for something else.
I was suprised at the ballistics over a supersonic 300blk and out of a semi auto looked like a fun shooter, and it really is. ( I needed a Project)
I pulled the barrel out of a DPMS Ive had in the safe for years and went to working up a load.
I ended up with 130gr Bonded bullets at 2550fps and 125 ballistic tips at 2600fps.
lighter bullets are pushing 3k.
I have shot several 5 shot groups under 1/2 moa and never had one over 1 moa.
It has 340 rounds total down the barrel.
I'm done playing with it and need to move it on to someone that will use it.

see barrel makers remarks here. http://ar15performance.com/6_8___cats scroll down a bit to find caliber.

This is a 16" helical flute barrel, 5R rifling, Melonite coated, threaded 5/8x24 for can or other muzzle device.
With makers Super bolt fitted to this barrel.
installed on an older DPMS rifle that has a Seekins 15" forend and a Rock River NM trigger, ACE skeleton stock. Also has a Vortex Viper LR 4x14 (I think) scope ($800 new) and Vortex cantilever mount on it. 1 PRI 5 rd mag.
All painted with Krylon camo for easy touchup :)

If there is a serious interest I'll pull it out and get pics and exact specs on anything I missed.

Id sell complete package for $975
Rifle less scope $650
Barrel and bolt $250
Email me and Ill send pics to serious buyers
barry dot mize at att dot net