this post was submitted on 12 Oct 2025

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The Ark

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Has anyone ever made 3dp star crimping dies? If so, how did they work? Wanting to make some 9 mm or 44 blanks for a 37mm launcher (fosscad.io)

submitted 1 month ago by noah@fosscad.io to c/ark@fosscad.io

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Originally posted by u/sponyta2 at 2025-06-30T16:52:05Z

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[–] noah@fosscad.io 1 points 1 month ago

u/GunFunZS · 2025-06-30 17:15:20 UTC · score 5

They would really need to be metal and with decent surface finish. I've used .380 seating dies for a conical crimp.

I think your easiest choice would be to buy a lee seating die and 2 bolts with the same thread pitch as the adjuster. In the first one file a crimp starter. In the 2nd one pilot drill to .125 then use a deburring tool to cut a cone.

So you get pre crimp and final.

Alt method is to buy 2 7/8-13 bolts and do the same. You absolutely will need to anneal from my experience.