It's fairly simple. For 30 - 32 cal, using 20/1, you need a reamer that is .002 larger than the size you want the base band to cast. It is best done in a mill. Put the mold blocks, in a vice (don't clamp to hard), indicate the cavity for center and squareness. Make sure the reamer is running true and ream to the depth you want. You can buy reamers, any size you wan. They are made in .001 increments. Ebay & MSC will have them. It can also be done in a drill press, using mold handles, by putting small clamps on the top and bottom of the blocks and holding it, on the table, under the reamer. The blocks should follow any run out that the reamer has but, I don't do it that way. Another mold that can be used, is the 311413. It's a really good bullet for this application and they all cast, at least .314, unless they are marked "U" or other marking that indicate that they are under size. They have a long GC shank and you can ream a base band and still have a grease groove left, forward of it like this one I did. It was my first 8.15 x 46R bullet and shoots very well. My groove is .316 and the mold only casts .314 but, I reamed the GC so, it casts .318. I also shot it BSed but, it could be shot fixed, with good loading technique.
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