[Unclenick]

The 12-year old zombie thread is addressing a slightly different situation, so I made your post its own thread.

There are other products that may help. Gunzilla works slowly but steadily to weaken rust and it can't hurt the steel or the finish. Some of the products mentioned in the old post might, like Evaporust. Kroil is also a good choice for penetrating, as are tea nut tree and wintergreen oil. I would let it sit for a week regardless of what you choose so it loosens deeply.

Shooting the round is unlikely to hurt anything if the rust has not penetrated the barrel deeply anywhere and there is no rust in the bore. The problem is safely checking the bore. Bouncing a flashlight beam off a mirror in front of the bore (and with nothing unsafe to shoot behind it or on the other side of a wall from it) is probably the best approach.