Had a new idea... But then checked C.O.A.L.

[cajuntec]

Just got a new (to me) barrel for my Contender - 7TCU. Started looking at the cases / dies / etc... and got to wondering...

Why didn't anyone ever try to chamber this in an AR? It uses the same cases (.223), so the bolt wouldn't have to be changed. I have really liked the 7mm's. I just might try to get a barrel chambered in this. Why hasn't this been done before?

Oh yeah. C.O.A.L. Dang. I thought I was onto something for a second there.

All the best,
Glenn

[cajuntec]

Rolled by the guy I purchased from:

[bearintex]

There have been iterations of the 7-300 blackout done in the past. I love the 7tcu. Had a 10" bull barrel that was a tack driver. Shot half a dozen deer with 140 ballistic tips out of it. Shot ihmsa with it for several years.

[Cajun Blake]

7TCU cartridge OAL is to constrictive in an AR magazine

most shoot the 6x45 = 6mm-223

[jesterdoc]

Just for curiosity...what's the OAL?

[Bowyer]

O.A.L. = Over All Length

[jesterdoc]

Thanks Bowyer, I know what OAL means...I was asking what it was. How long is the loaded round?

[bearintex]

The 7TCU case is formed by either expanding and fireforming, or simply fireforming 223 cases. No cutting or trimming required other than fine tuning. I used to do both ways. If I didn't anneal the cases, I had 1 or 2 out of 25 split when expanding. The final cartridge can be up to 1/2" longer than a standard 223 depending on bullet selection.