Calculations for creating a custom shot bushing

Someone asked for details from my previous video, how do I calculate the dimensions for the 5/8 and 3/4 oz shot bushings (made from powder bushings that fit inside the 1 oz shot bushing). This video goes through the tedious process and the math. If you are not a math person, it's not for you.

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I ant good at maff, Iam bedder at spellun.😎👍