By sources other than Winchester(Hodgden), that is pretty tame. I don't think Hodgdon wants to push their powders, myself.
Speer #13 goes from 5.6 to 6.2 Grs. W 231 for 789 to 858 FPS from a 4.4" barrel. (more reasonable)
Midway's "Loadmap" goes anywhere from 6.3 to 6.6 max for W 231 and 230 Gr. bullets, although at that level it is quite stout and I do not recommend over 6.1 myself.
Remember, we don't expect to get our desired velocity with our start load. If we did it right we get a nice starting place to work up from.
I have shot 6.0 Grs. W 231 with the 230 Gr. XTP @ 1.235 O.A.L. without pressure signs in 75 to 80 degree temps, but that load is Stiff and Snappy.
I much prefer 8.5 Grs. AA # 5 with the Zero 230 Gr. bullet. I got an Avg. velocity of 859 FPS in 85 degree weather (4" barrel CDP) with no pressure signs and "smooth for the velocity" recoil. (Zero JHP because it is accurate and much cheaper than the XTP.)
Speers factory loading of their 200 Gr. Gold Dot is 1.211 O.A.L. by my measurement. I suspect their 230 Gr. O.A.L. is very similar.
I pushed the 200 Gr. Gold Dot to an Avg velocity of 919 FPS (4" barrel CDP) and an Avg. 876 FPS (3" barrel CDP) with 9.4 Grs. AA # 5 at an O.A.L. of 1.215 at 95 degrees.
These loads were safe in my guns with my load procedures, Reduce 10% to start.