Inside Neck Reamer (.243 Diameter) by FORSTER RELOADING PRODUCTSNeck Reamer #243 and for Original and Classic and Power Case Trimmers. Use with .243" diameter bullets. 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. The Forster Neck Reamer is manufactured from high grade and wear-resistant tool steel and ground .0025" to .003" over the maximum bullet diameter. The staggered tooth design cuts the brass smoothly without chattering.