My cleaning procedure has been basically the same for a while now with no rust issues.

My process:
Before removing the breach plug (on the inline) I scrub the bore with a brass brush soaked in Hoppies no.9 with a patch wrapped around it. I let that soak for a few minutes while I remove the bolt and switch to a cleaning jag. I then run patches through until they come out dry and mostly clean. I then run a couple of patches of brake cleaner down bore to clean the rest of the Hoppies and any left over fouling out followed by dry patches. At this point the patches come out virtually clean. I then run a few patches soaked in Ballistol and let that soak a minute or two. Then a few dry paches to get that out. Then a few more patches with brake cleaner to dry that out. I clean most of the fouling out before I pull the plug to minimize fouling getting into the breach plug threads. I then pull the breach plug and spray it and the boltdown with Ballistol (it seems to take the fouling off better than anything else I've tried)and let it soak while I finish the barrel. I then clean the breach plug area with brushes and patches with solvent and run patches on a jag to get anything that was left in the bore out.I then clean the bolt and breach plug using a brass brush to remove the fouling and wipe them down with CLP before reassembling the bolt. I put antisieze on thebreach plugthreads and reinstall. Once everything is clean, I run a bore mop saturated with Break Free CLP through it for final bore protection, put everything back together and wipe down the outside with CLP before putting it up.

Like I said, I've never had a problem with rust until this incident so I'm not sure what happened. I didn't use any water in it and after running the brake cleaner the bore is so cleanthe patches sometimes squeek as they go down.

I've been using 777 2F for over 2 years now.Using this process to clean, I have not had any crud ring problem and my breach plug comes out with little more than finger pressure even after 30 to 40 rounds. Before shooting, I just run a few dry patches till they come out dry, fire a 209 primer to dry out the breach plug, load and fire. Works every time.