Bill B and I are close but I'm taking a firmer stand than He. I believe a hummer rifle can teach anyone with fingers how to shoot.
This one needs a little expansion. The word "hummer" is used two ways. I think the term was coined by Tony Boyer, to mean a rifle (actually, a barrel) that was more than honest. Way back down the thread, Wilbur mentioned a barrel that performs the same in the wind, whatever that wind happened to be -- that is, you could trust it.
A Tony Boyer "hummer" does better than that. For some reason that no one knows -- and a lot of the best manufacturers and gunsmiths have looked -- the barrel helps you out, letting you make a small mistake and get away with it.
Other people use "hummer" to just mean a good barrel, a synonym for "honest."
So yes, a "Tony Boyer" hummer can, as long as it lasts, make a competent shooter a world class shooter.
OK, all the above is just a description about how different people use the same word to mean different things. If you've been around BR awhile, you already know that. What follows is just my opinion.
That "long as it lasts" part is tricky. In CF, that's about 250 rounds at the world-class competition level. Oddly enough, in 1,000 yard shooting, with all the wind conditions, it will last longer. There is a reason that the new 10-shot, single group world record just recently went into the high twos. It isn't because long-range shooters can't shoot.
OK number 2: Where RF and CF part company is in RF, a barrel lasts longer. But also in CF, you load your own ammunition, in RF, no. Which is most important? Don't think that's the right way to look at it. It takes both. The problem, as with all benchrest shooting, is the skill, the experience needed to evaluate both.
And for success, don't forget reading conditions. A hummer only helps you with small mistakes. (As a note that doesn't apply to point-blank BR, reading conditions only matters when the wind is terrible in 1,000 yard BR. Maybe 200 yard RF is similar, I don't know.)