Wait, let me get this straight - are you using a SP-10 with a 16ga filler, or a SP-16 wad in a 10ga shell ? I don't have a SP-16 wad, but I'd bet dollars to donuts that you're gonna get a whole lot of powder migration past a 16ga wad in a 10ga shell. You'd have to keep the shells upright not to. And if they lay in your shooting coat shaking around while you walked, just how much powder would leak by ? I put 16ga filler wads inside SP-10's.
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Paul Harm
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