Depending on the primer, that's a pretty hefty load for singles. I personally use 17.5gr of claydot in Rem hulls with 1 1/8oz loads and a cheddite primer. I use the downrange figure 8 copy with this load and it seems plenty fast enough. The same wad with around 20 gr of Green Dot will do the job from mid distance handicap range.
STS or Nitro, 17.4 of Clays or Clay Dot, DR XL-118 with westcoast 8's Win209. When I do it right, nothing but dust hanging. Sadly, not every shot.
I believe from published data the above would be just a tad faster than 1150 fps. Allowing for Kentucky windage and hull age, should be at least 1150. Both of the above powders never vary even .1 grain with my Spolar. I did get +/- .2 grains all the time with the 800+. Not the end of the world, but I did notice the difference. I weight 2 shells in every 25, and that has been the case in over 15,000 reloads.
i use a rem hull, cheddite primer, downrange XL1 wad, 1-1/16th to fill the hull up for a nice crimp & 16.5 grains of claydot. i would not want to shoot 100 rds with 18.0 grains of claydot. grind em up, razor