I just called RST and the man who runs the loading told me they use the SP-10 wad and a 16ga card for filler. He said the SP-10 was a better wad than BPIs. He claimed the base was a bit small in diameter so some gas could leak by keeping pressure down. He said it would still seal and was consistent. Also said it was a bit higher so a little less filler wad was needed. I didn't think of asking what powder was used.
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Paul Harm
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