Free: Contests & Raffles.
I understand the concern and I thought that also. I can say I have done this for many years in my White's and never had a rust or pitting issue of any kind. Like I said I would not do this with Prodex P.
That's good to know because I'm using Triple 7 but have never left the gun un-cleaned, even just overnight, after having fired it.
No fouling shot. I keep my bore as clean as possible. I run a dry patch to the bottom and with the ramrod and patch in place I pop a cap into the patch to clear the nipple. Then I remove the patch and load it. It stays loaded until I fire at an animal or until the season is over, whichever comes first.
There are a couple of reasons for a fouling shot. One is to get rid of moisture and cleaning solution or oil in the barrel. I do this after the gun has been setting for a while. I then clean with a wet patch and followed with dry patch. When I am going to go hunting, I get a 1/4 inch square or tissue or similar paper and lay it on the ground. I place the end of the barrel a couple inches from the paper and snap as many caps as required to blow the the paper away. You will notice the very loud reports from the cap often will not move the paper. The second reason for a fouling shot is when in competition, or to correct a barrel that shoots significantly different from a fouled barrel as compared to a cleaned barrel. In competition unless you shoot a fouling shot, the first shot from a cleaned barrel will hit off slightly from the following shots from a fouled barrel, even though you clean with a wet patch followed by a dry patch between shots.