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I am using an RCBS mold # 44-379 and cast my own bullets 20-1.
I made my brass out of Starline 45-90 cases, I turn the rim down .007-,010" in a lathe to .595".
I then push a .462 rod down the inside of case until the base/web area swells out to .513/514" (about .460 from base/primer side).
I then size in a die and you are ready to load powder/primer/bullets.
The brass fireforms concentric and I have not lost one case to splits.
after firing I only full length size until I just kiss about 50-60% of the neck and body and check in chamber for smooth chambering.
Its pretty simple if you are the least bit handy with hand tools.