Hi Chris!
The answer to your question lies in your bore actually. Slug your bore (with a soft lead slug preferably) using a series of hardwood dowels and a nylon mallet. Measure the diameter of the slug and record it. Add 0.001" to that diameter and that is the 'starting diameter'. You will realize great results by adhering to this method. I hope this helps you.
Matt
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Matt Dardas
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