The Neck Reamer applies only to the Original, Classic and Power Case Trimmers. The Forster Neck Reamer is manufactured from high grade, wear-resistant tool steel, and standard Neck Reamers are ground .0025" to .003" larger than the maximum bullet diameter. The staggered tooth design cuts the brass smoothly without chattering.
Thick case necks can cause high chamber pressures and flyers. The Forster Neck Reamer mounts in the cutter of a Forster Case Trimmer in place of the pilot and removes the excess brass from the neck walls.
Standard Neck Reamers are intended for use after the cases have been fired with a full load and before the neck or full-length sizing operation.