I did a deliberate experiment along these lines.
A few years back, Black Mag3 had just come out. The manufacturer billed it as "non corrosive."
I noticed that Cabelas did not bill it as "non corrosive."
Nevertheless, I bought a pound from Cabelas, with hazmat fee it was around fifty bucks!
I wanted to try it in my cap and ball pistols, call me a wimp, I am just tired of cleaning these pistols.
My Hawken is lots easier to clean.
So, I loaded and fired one cylinder of my .44 with the BlackMag3.
Thank God, I did run a patch or two down the barrel after firing. Otherwise, I did not clean the pistol
Then, I let the gun set in a drawer.
Oops, I was a sloppy scientist! I meant to let it set for 2 weeks, but I let it set for 8 weeks.
This is in the North Carolina mountains, very, very humid.
I pulled the pistol from the drawer, the hammer and cylinder were covered with red rust! The barrel was ok.
Boy did I feel sick, this is a $350 Uberti Cattleman.
I spent 2 hours cleaning my poor pistol up, had to take it all apart, that hammer was a mess.
I did get it cleaned up pretty well, and it shoots fine now.
Gee, I wonder why Cabelas quit carrying BlackMag3.