ok according to alliants web site the rem. sts hulls at 1150 fps is 16.5 grains, 1200 fps is 17.8, 1250 fps is 18.7and 1310 fps is 18.7 and that data is using rem 209 primers and cb1100-12 wads. As far as the win 209 primer it gives a different wad with that one so the charge is different
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