Manson Precision rimless rifle cartridges are engineered by Dave Manson and made to SAAMI specifications for .257 Roberts caliber.
The finish chambering reamers are crafted from M7 high-speed steel and feature integral throater and solid, fixed pilots for precise chambering and accuracy.
These reamers come with a solid pilot, six straight flutes, and a right-hand cut, with different shank sizes for rimfire and centerfire cartridges.