20mm crimp die

This is an evolving series of crimp dies for 20mm ammunition to fix bent/expanded necks.

I focus primarily on 20x102 and the latest v7 and v8 are for the M55 series, trying to get the crimp groove working well.

Some of the early variants were different diameters, trying to find what works best. Sometimes you need the larger size to get things started, then can tighten it up.

Printed in PLA, 100% infill, I have cranked on my 5ton vice with a cheater bar and havn't broken one yet. The ridge for crimping the groove gets smushed tho.

Requires a hefty vice, cheater bar and a pair of 6mm screws cut to length. I use the ikea screws with shanks as they slide nicely.