Let's just say I'm not impress by Berger nor his bullets. Nor do I think there is any magic in a "bench rest" crown. A crown is merely to protect the rifling. As long as it is concentric to the bore, it's a good one. FYI I have seen about a gazillion bench shooters clean their rifles and the next one I see unscrew the brush after running it thru the bore will be the first one. Where are you getting this goofy info?
Whether they cringe or not is of little moment to me, if any of them would like to return my money and pay for the return shipping, I'd be happy to send their barrels back to them. Or better yet, don't take my money in the first place. Maybe put it in their ads: "We don't sell to folks that use JB"
I'm kinda of the opinion that when I buy the barrel, it's mine. If I want to use it for a tomato stake, that's my business. If anyone doesn't think the barrel should be scrubbed out with JB paste, then don't do it. Burn out your throat instead for no reason with that silly-assed shoot one, clean one routine. Maybe your rifles are smarter than mine but mine can't count.
As I said, it works for me and I've yet to have a rifle that it didn't improve in accuracy and cleaning.