Rock Creek Barrels are made in Albany, WI. They produced about 2000 barrels in 2010, 25% of which is contract work. The vast majority of barrels made are cut rifled 5R barrels, but button rifled barrels are available. They have 7 twin spindle drills, 2 twin spindle reamers, and 5 twin spindle riflers.
A little known fact about Rock Creek Barrels is that they have been using gain twist in their barrels for years. The gain is parabolic and is not a user option. It averages about .5" to .75" of twist
Rock has achieved impressive results with their Metford rifling in their 4 groove rimfire barrels. They are adding .375 barrels to their lineup in 2011 and continue to test new types of rifling to improve on the 5R concept
Rock Creek contours can be found HERE, and the home page can be found HERE