Sure it works, but I think it has been explained earlier. The 30 carbine ammo is quite a bit pricier, and a little harder to find. I personally didn't care for stressing about losing the brass.
With it chambered in the tt round, I just plink, then sweep my area clean. I also don't care to reload for a semi-auto. Lots of work for such a short duration of fun. SKS type fun for even cheaper.
Each to his own, I say. It suits me better re-chambered. I would buy a semi auto in this round if I could find one. I couldn't find one, so I built one. I also plan on building a bolt gun in this same round, just because I want one and as far as I know, they don't exist.
That would be pretty fun.
Do you take what you can get or do you get what you can take?