Abstract: A bolt action rifle having a flange projecting from a ring captured between the barrel and the receiver, the flange mating with the undercut in the bolt needed to pass the cartridge during loading into the grip of the extractor to achieve controlled round feeding, the flange serving to support the cartridge during detonation in the area of the cartridge which otherwise would be unsupported.The mating of the flange with the undercut of the bolt requires a non-rotating bolt. An inner bolt sleeve is provided, axial movement thereof serving to control rotating locking lugs at the front of the bolt which lock the bolt during detonation.