Forster Inside Neck reamers are designed to remove excess brass from the inside of case neck walls. The Forster Neck Reamer is manufactured from high grade, wear-resistant tool steel and ground .0025" to .003" over the maximum bullet diameter. Constructed with a staggered tooth design so that brass is cur smoothly and without chatter. Neck reaming should only be performed after the cases have been fired with a full load and before the neck or full length sizing operation. Wall thickness can be measured with a tubing micrometer, but a simpler test for excess brass in the neck area is to slide a bullet into a fired, unsized case neck. If you feel interference, the neck should be reamed or outside neck turned.
Wildcat conversions using the .224” bullet with .2200” inside neck diameter and .243” bullet with .2390” inside neck diameter, Forster offers inside neck reamers for these sizes. Use after the CASE sizing operation.
Sinclair, Issue:5B, Page:014