I suppose this could come under the heading of dumb question #7635 but here goes.
I was asked this question recently and had really never given it much thought till then.
I always assumed that the RF bullet just went down the barrel without touching "sides nor top or bottom" because of the somewhat greater diameter bore and in effect one had a 3" barreled 22 RF with a long sight radius. A fellow asked if the bullet actually was stabilized to any degree by the barrel. I said no but now that I have given it some thought I guess I really don't know.
I do know the barrel is incredibly dirty after shooting the conversion but does just wipe right out.
So my question is, does the barrel in any way help stabilize the bullet by actual contact?