The R&S has a smaller center pin or arbor. The R&S has a larger cylinder Boss to retard fouling. The R&S has chamfered chamber mouths to accept the .457 bullets or RBs. The larger .457 swaged to a .453 gives a longer bearing surface allowing accuracy at higher veloicty than a Remington. The R&S has a much improved loading lever latch which Ruger used in the ROA. The very expensive R&S made by DPS is used by the International BP Shooting teams.
