That's not right. I just took a look at mine, and the base of the cartridge protrudes .190" from the end of the barrel, when chambered. (About even with the front of the cannelure.)
You have an unfinished barrel -- barrel nut not installed, and chamber not finished reamed. I once saw one of these barrels, in similar condition, that had no chamber at all.
How do you plan to install the barrel nut?