Rattlesnake Charlie
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It is not that simple. If using shotcups, they have different thickness and sometimes the wall is even thicker at the bottom of the cup than the top. If loading without shotcups, the individual hull can make a difference. The reloading manuals give you the details of how many layers and how man to the layer using specific wads and hull. Most of my work has been with 12 ga. I like to use wads with shotcups. Just pattern better for me. Some wads let me use three layers of three 0B, and others only let me use layers of three if I use 1B. With thick shotcup walls I can use layers of two 0B. A web search for “circle packing” will get you some info on how many of what diameter you can get into a shell/bore/wad.

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