from 1996 Alliant Reloader's Guide
Cowboy Action Load Data, 5 1/2 in barrel, 200 gn lrnfp
4.4 gns redot 645 fps
6.4 gns redot 886 fps
Pistol and Revolver Loads
using 200 gn jhp
9.7 gns red dot, 1,320 fps, 34,800 psi (max)
might also check Speer's 200 gn gdhp short barrel data
The lighter 200 lrnfp loads will likely have a noticeably lower poi than the 240 gn loads