300 blkout cutting casings

[gomer pyle]

A buddy at work recently bought a Daniel Defense in 300 Blackout. Every time he fires it, it either rips the casings in half or if it ejects, it has a ring around it where the others are coming apart. I told him he needs to contact DD but he would rather fix it local if possible to avoid shipping back and forth. 

I know I'm not explaining it very well but does anyone have any ideas?

 

[RED333]

Sounds like a a barrel issue, in the chamber. My money it will need a new barrel.

[Danger Rane]

If it's making a ring on the brass on some and ripping others in the same place I would recommend he disassemble and check the chamber for abnormalities. I would also chamber a round and extract it without firing to see if it leaves this ring before or after case expansion. Did he buy this new or was it previously owned? If new I agree with your recommendation, send it back and DD will make it right.

[gomer pyle]

From my understanding, it only does it after firing. He did try multiple brands of ammo. I'm pretty sure he bought it new.

For my knowledge, what would be the problem. I know you said he would probably need a new barrel.

[Photoguy67]

I don't have the rifle in front of me so this is just a guess, but it actually sounds like excessive head space. 

 

[Omega]

Yea, seems like a headspace issue with what is known.  What type of ammo, reman, reload or new commercial?  The only issues I've had with my 300Blks is denting the case mouth, and a strip of velcro fixed that.  If a bad barrel, it's  rare it came out of DD that way, but one can slip by I suppose.