They were wearing safety shoes even before OSHA.

Raimey, I didn't try any shells in it. The chamber diameters should be fine.
I use the rust-blue method, using Laurel Mountain Forges Barrel Browner. I might have to wait for the weather to get warmer to have enough humidity. Even in the heated box this time of the year might not be enough humidity.
As for how long it takes, usually it might take between 6-8 rustings.

Again thanks for all of your help. It still amazes me on the wealth of information here.

David