Rifling cutter dimensions, help ideas

Well I guess I start shooting in the dark. Today I start milling and cutting my test pieces for a cutter. Once I get 4-5 starter pieces I'll start laying out what I think l will work then start shaping. Once I get what I think will work along with the cutter body I'll move on to hss or carbide.

This has to have been done before and I really dont want to reinvent the wheel.
 
Well got the 1st attempt done and realized some mistakes and things to do first on the next one....will do that tomorrow and think on it until then20210310_130737.jpg
 
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