Mickey
No, I made it out of Stress Proof, which is a higher carbon sulphurized steel that machines great, and has a fantastic anti-gall quality. We use a lot of it around the shop.
The most difficult thing to do on the Redding Sleeve is boring the hole for the bullet seating stem. It has to be a very close fit. The one I used measured ,2435.
I did that end first, (after turning the OD to .6255), and then turned the piece around, indicated it dead true, and bored and reamed the sleeve with the Beggs Reamer.
What would make it easier is if you had a Redding die for an old 6x47, the one made from a 22Mag necked up to 6mm. All you would have to do then is chuck it up dead true, cut it to the correct length, and ream out the hole with the reamer to the correct depth. You would then cut the body of the die to the correct length as well.
I don't even know if Redding makes that die. But I bet Wilson does, or just buy a 6mm wilson blank........jackie