You better make that two ounces of prevention using that Bore Butter.[8D]
No need to field-clean -- even after 35 shots. All that's necessary is a bore swab every couple of shotswith a mild solution like Windex, alky or spit. Every 10-12 shots, run a pick thru the nipple or breechplug to keep it clear. If using 777 with an inline, crack loose the breechplug - then re-snug every 8-9 shots if you only grease the threads.
There's your new cure!...lol [X(]
Oops.. I forgot to mention this!
Better-yet, if using sabot/bullets, buy a good gun oil that says it prevents rust. Then take that Bore Butter & put it in a stowaway bag - then toss that bag into the rafters of your garage.
Once every five years, clean your rafters. Move that bag to a new spot for another five years. Keep repeating that procedure for the next 40 years... lol
P.S.... I cannot tell you to throw that Bore Butter in the garbage anymore. Poster Phil doesn't want me to do that anymore. So if you must make more rafter room, put that Bore Butter on a table at your next Garage Sale.
Suggested retail should be around 99 cents..lol [:'(]