Some say the peroxide will do damage to the barrel if left in the bore. I haven't found this to be so with any of my smokepoles, but I do dry them very well, and live in a low humdity area, and then grease 'em down (bore) with a non-petroleum oil. RR
RR-Mule snot or Friendship speed juice is best for BPCR's where you don't have a breech plug, as the stuff will seep into the breech plug threads and
cause serious corrosion in no time, that's why the stuff fell out of favor
almost overnight, if you've been using that stuff in your ML or buy a ML where you suspect it's been used you need to de-breech and clean up the threads with a wire wheel if the corrosion isn't too advanced then coat the threads with a serious rust preventative oil then slather on anti sieze grease, the corrosion can be bad enough to make the breech structurally unsound. Just about everyone I know used the stuff at one time.
As to the non petroleum oils, I think the best bore protection is from Petroleum based oils, the best I know of is LPS 2 or LPS 3 for longer term storage, the petroleum thing is a bit confusing some petro based
oils will turn into an ashaultic varnish when exposed to the heat and BP residues, the bad news is many vegetable based oils will do the same things even worse, try linseed sometime it's worse than any petro based oil, even bore butter will create varnish over time, any protective oil (seed based, vegitable or mineral)should be removed prior to loading, I use a patch saturated with cheap aerosol brake cleaner Bra-Kleen, it zaps all the oil immediately.
So much of BP common wisdom is derived from misnomers and then becomes gospel, the Wonder Lube 1000 and T/C started all that bore seasoning crap in the mid 80's, the non petroleum based deal is part of the pitch. Most commercial BP bore cleaners are a scam T/C# 13 is 90%
water 10% silicone so it can be used as a pretty lame patch lube as well as a cleaner, Moose milk is water and water soluable machine oil. Cider vinegar, highly diluted anti freeze, automotive windshield wiper solution and non ammoniated glass cleaners are all superior to just about any commercial BP solvent.
Regards fredj