I went with a 221 form die. It is the parent, and I use it for other wildcats.
You will have to neck turn from my findings. I have read where others say they had no issues, and used brass as is. I did some checking on my 20’s and 17’s, can’t chamber them as is.
As to neck turning or reaming, I will neck turn myself. Reaming will not true up neck wall thickness evenly.
I tried using 30x221/300BO virgin brass. For what ever reason my success ratio was not good at all. (I have formed over a dozen different wildcats over the years, so it is not new to me)
Maybe it was the lot of brass I had? Maybe not.
I used 222 brass from Starline with good success.
I annealed ALL of it after sizing, neck turning and final trim.
I bought a 221 form die, Wilson case checker, 20 caliber neck turning mandrel and Starline brass, chop saw and a jig, all of it for less than $500, I see no issue for my future use of 221 brass forever.
Making all of my brass also forced me into finishing my project for my Forster trimmer and neck turner
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