Do you have access to a chronograph? The following load is right from the Alliant website.
2 3/4" Remington Nitro
Federal 209A
17 gr. Red dot
Rem. RPX
1 1/8 oz lead
1200 fps
10,100 psi
You could safely swap a Winchester 209 for a Federal 209A (but I would not swap the other way around), although your velocity is likely to be a bit lower. With a Win 209, 17gr Red Dot is likely between 1150-1200 fps.