I was introduced to JB boar paste, about 25 years ago, when I was shooting light varmint class benchrest centerfire. Everyone used it to clear their bore, and there is no group I’ve never met a more finicky bunch than the centerfire BR group. The guy who introduced it to me was a machinist, and held the world record for a rail gun at 200 yards.
It is a very mild cleaner That many believe mildly smooths your bore. I have used it on airguns, centerfires and rimfires. It always makes the bore foul less, And seems to generally improve accuracy. It also gets the bore absolutely clean.
mike