Thread: Donuts in 243 necks

Sounds like the brass is more than once fired and that the rifle used had a chamber way larger than yours. If it were me I'd take the annealed brass, FL size it with the type s (doing the neck) and then see if it chambered. If that made a doughnut then I'd then use the neck turner on them and cut it right to the shoulder. Leaving a few mm there can result in more doughnuts.