All powder companies have websites with loading data. 3" data is sparce, but they all have something. I use my normal competition 2 1/2" .410 loads for my 3" shells and fill the case with shot. The extra shot may raise the pressure a bit but not to an unreasonable level. My 2 1/2" load is 14 plus grains of 296 and an orange PC wad. A AA Winchester wad or a Remington wad is just as good.
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