There's really not any benefit or need to season modern steel with Bore Butter. That's a notionlinked toold wroughtiron barrels.
I've heardoffolks treating their bore with synthetic motor oil toofor better accuracyand they claim thatitabsorbs into the pores of the steel and lasts for a number of shotsmuch like a Slick 50 enginetreatment. Hmmmm.....
But TC actuallyrecommends againstusing Bore Butter when shootingsabots. When asked, they've clearlysaidthat a cleanbore shoots sabotsthe best, yetsome folks use it anyway.
Since the boreneeds to be thoroughly cleaned after shooting there's no seasoning effect tobegainedby using it.
I think that it'ssimply a handy BP patchlube withmultiple uses, but oflimited benefit.