In order from fastest to slowest velocities
RL17
N550
Superformance
WIN760 / 2209 Same velocity at max charge.
RL22 & 2217 would both have to be very compressed to get the same velocitys as the above
GRTs powder data doesnt appear to be accurate / line up with hodgdon manual or peoples real world experience with staball 6.5, it suggests it to be the slowest of all these for velocity by far.
I have no experience with staball 6.5 but have found superformance and other ball powders i have tried to be very temp sensitive which put me off it, and ball powders in general. i much prefer stick powders.
N550 would be a good option, gunworks have it in stock & on paper should offer better velocity over superformance & none of the temp sensitivity
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