Dennis,
I don't have the time right now to quote the article, but a few months back there was a lot written in the British magazine Airgun World about exactly that. And, now some of us in the benchrest community are thinking exactly that. In fact, I hope to be ordering a .20 cal. barrel for my Theoben as soon I can afford one, which is looking like maybe not much before next year with the initial cost of getting all set up.
Dave