I tried 9 grs of unique in some 45 colt loads. The uberti 1873 sporting loved em , chronoed at 1298, the cattleman on the other hand, gave me 933 fps, but with flat primers and some serious recoil. I think ill drop down to 8.5 grs, it should still give me in the 800s, but take it easier on my cattleman
You don't state what bullet, but let's assume 250 gr. Your load is max in some manuals, below max in other manuals and according to data developed by individuals. Of COURSE it recoils. You're firing a 250 gr. bullet at 933 fps out of a 37 oz. revolver. What'd you expect? But said recoil is not an indication of pressure, nor are flat primers, necessarily.
My Alliant book from 2009 shows a max of 9.5 grs. of Unique with a 250 gr. SWC, .5 grs. below your load.
Incidentally, the data quoted in a previous post from the Lyman 49th manual is regurgitated from the Lyman 2nd Edition Cast Bullet Handbook published in 1973. I have both and the loads tested/published in 1973 are grain for grain, fps for fps identical to those in the 49th.
John Taffin lists 10.0 grs. of Unique under a 260 gr. cast SWC. This is the same load Elmer Keith used and is .3 grs. under the max load listed in my old (1959) Lyman cast manual.
Running a 250 or so gr. bullet 900+ fps out of a 45 Colt using 14,000 psi data is not "making a magnum" out of this cartridge. I found it a little odd that the black powder guys think nothing of cramming a 45 Colt case full of FFFg and running a 250 gr. bullet 900+ fps, but jump up and down when someone does it with smokeless powder. You fellers need to think outside the CAS box and realize many of us, self included, use our CAS firearms for more than CAS.