I've had and still have a number of three groove barrels on hunting/varmint rigs as well as my .30 cal Benchrest guns. In fact, they offer benefits in certain situations. Currently, my three grooves are in 22BR, 6BR (two) and .30 cals. from Lilja and PacNor.
The two mediocre Benchrest barrels I've had were 4 and 5 groove...one button and one cut rifled from two different makers.
Good shootin' -Al
