Andy, I once called RST and ask what wad they used in their 10ga shells. Remington SP-10 I was told. I said they seem to be a loose fit in any 10ga shell. He replied " how do you think we get low pressures ? " I once ran out of my 3/4oz 12ga reloads and had some 1oz RST shells handy. They shot every bit as soft as my reloads.
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Paul Harm
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