Currently working on the Modelo Polylactico and was wondering if anyone else had a good solution for sanding the longer Intermediate shells. I had no issues using a 6mm drill bit + painters tape shim as a mandrel for the Beginner 209 shells, but the Intermediates don't have enough surface area or depth due to their smaller holes to stay on the other smaller drill bits I've tried. I suppose I could force/tap an M2 or M3 screw into the top powder hole but would widening the hole cause issues if its sealed well?

I also noticed that the shell models had inconsistent rim thicknesses in Orca.

• Headspace gauge/jig rim: 1.8mm thick
• Intermediate .355 rim: 1.6mm thick
• Beginner 209 slug and shotshell rims: 1.2mm thick

Obviously there would be an issue if the 1.2mm rims were used to headspace, preventing the thicker shells from loading, but wouldn't too much headspace also cause trouble like light strikes and case bulge/FTEs?