You may get that much (900fps), but I have never loaded a sabot in my 6" 50 cal. plains pistol. According to the Lyman BP Guide a 245 grn. conical would travel at that velocity when stoked with 40 grns of Pyrodex. What I have done is loaded a 350 grn TC Maxi conical on top of 40 grns. of FFFG Goex, :eek: sort of a howdah load that mimics a healthy loaded .44 Special in recoil.
KJeff50cal