Thick necks can cause high chamber pressures and erratic shooting. Neck reamers remove excess neck material to insure adequate clearance exists between the case neck and the chamber. Also, these reamers can be used when forming wildcats from a parent case. The 50 Cal Neck Reamer is used in the 50 Caliber Trimmer in place of the trimmer cutter. Standard reamers are sized for use on fired, unsized cases. Special sizes can be ground but will extend lead time, please call for pricing and availability.