Try 19 gr Red Dot, Rem Fig 8 wad. Use 1 1/8 oz of magnum #8 up to 22 yards, #7 1/2 from 23 to 27 yards. This load should give you 1200 f/s with 10,100 psi of pressure. If you feel that you need 1255 f/s like the "HDCP Dr.Eq." on the Win AA Handicap load boxes then you need to switch to a slower powder like Green Dot.
Cross check against your Alliant Reloader's Guide or click =>http://www.alliantpowder.com to get to Alliant's website and their on-line guide.
I prefer Hodgdon Int'l clays for my 1 1/8 oz 1200 to 1255 f/s loads.
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