I am using SR4759 (20.0 gns.) topped with plastic filler under a 210 grain bullet. I use the SR4759 as I already had it on hand to load "duplex" in my 57 Sniders and 577-450 Martini Henrys. These are the first with the filler which weighed 12.7 grns. to fill to within 3/16" of the case mouth. Off to the range when I get a chance. Bullets are from MT Chambers Supply...x-hard alloy with gas check @ 205 grns. and .314" diameter. I believe the bullet is the 314299 from Lyman. Great to see some posts about using cast.
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