TRSR8
Silver $$ Contributor
At the risk of dragging this out, since you asked a sincere question, you deserve a straight answer.One source of information came from Lilja, but it's not the only source that was similar as I recall. I kept in contact with Lapua on the 22 stuff at one time, but I could be mistaken about what I got from them as opposed to other source.
If anyone has a more definitive answer, I'm open to learning.
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22 Rimfire Maintenance - Lilja Precision Rifle Barrels
The difference between rimfire and centerfire barrels is that rimfires requires essentially no break-in procedure. Here is a recommendation for cleaningriflebarrels.com
If you’re shooting a competitive rifle, usually with a match barrel, most clean with a quality rod/ boreguide and clean every target or two with a minimum of oiled patch followed with dry and often go with a quality bronze brush with RF solvent and often apply C4 in the throat….let it soak, takes care of carbon buildup…..pretty easy.
These steps in some frequency are employed by the majority of great shooters that I ever witnessed and I’ve shot with plenty of them over the years.