I load Rem STS or Win AA hulls personally. And have used 11.6 grs. of Universal Clays, Win 209 primer, with a Duster wad and 3/4 oz of 8 1/2 shot for years. It's very mild at about 1100 fps, and works great in my English doubles. As long as it crimps OK, it should be fine in RST hulls... which I believe are Fiocchi.
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