If you have a machinist friend nearby, you could get the .358 collet and have him (or her) turn grooves on the inside surface to grip the bullet with. The collets are hardened steel, so they would need to use a carbide boring bar or thread mill. I would be happy to do it for you if the shipping isn't too much of a hassle.
Another idea, you could have a machinist make a collet out of mild steel and groove that one. It would be an easy job for anyone who knows the trade.
Last edited by Protocall_Design; 12-30-2018 at 02:52 PM.
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