I will have scratch my head a bit and draw it up.Care to share that "Rim turner" idea?
I have a lathe so the "best" rim turner would be a pot collet reamed with either a chamber reamer or sizing reamer so the rim is proud. Then make a shaping tool.
A "manual" tool say something that could run on a Foster trimmer or similar lathe style trimmer will take a little more thought and engineering. My concept is still very similar. Make a collet that fits the case shoulder, a shaper tool. Feed via a lever and stop.
I'm working on a broken 6-48 tap, some 257 Roberts Black Powder Only cases, a Hydro die for 375HE, resize die for 375HE, Rebarrling my BIG action with the 375 Barrel and opening the bold face from RUM to CheyTac/HE.
I should have the rim turner done in a couple hours.
