Since I don't consider bench rest to be any more than one measure of accuracy potential, whether a break action rifle is used on the circuit or not doesn't show me anything.
I don't shoot alot of paper I shoot alot of pds....I have several dedicated rifles for doing just that. We shoot ranges from something less than 30 yds. to well beyond 400yds. My TC Contender carbine in .204 Ruger will hang in there with any bolt rifle brought out to the pasture to date. My kill percentages are as good or better than the guys I shoot with. They all use bolt rifles, I rarely do. I have many other break actions that will do the same...it is a measure of accuracy that means much more to me than making holes in paper.