[Alpo]

If I'm deciphering that correctly

You have some 7.62 NATO ammo and are shooting it in your 308 bolt gun, but the fired cases will not eject. The ammo fires fine, but the cases will not eject.

You have some commercial 308 brass. You resize the commercial brass, prime it, pull the bullets on the NATO ammo, pour the powder charge from the NATO ammo into the primed commercial brass and seat the NATO bullet.

Now, when loading them into your 308 bolt gun the round will chamber, the bolt will close, but the bolt handle will not go down?

Two things come to mind.

The commercial brass is once fired. Possibly the resizing die you used to resize this brass was not set up correctly, and therefore did not completely resize the case, and this prevents it from completely entering the chamber, and with it not all the way in, the bolt won't close.

The bullet could be seated out too far. When the round is chambered the bullet is pushing against the rifling, which could also prevent the round from completely entering the chamber, and again, the bolt won't close.