Thread: Doughnut issues

The doughnut which can be caused by sizing and brass flow, normally builds up after a few firings in the neck shoulder junction area, alot of people don't realize that they have a small doughnut causing neck tension issues. Because of this all of my throats are set up so the rear bearing surface of the bullet stays at least 0.020 thousands in front of this area as already stated above. One tool that I found very helpful in one rifle I used to own with a very short throat is the K&M carbide neck turning mandrel with doughnut cutter, you just expand you necks with the expander mandrel then run it over the carbide turning mandrel and it will cut the doughnut away with out cutting any other part of the neck, worked a treat.