My hornady 9th edition lists a start load (using Unique) of 5.1 gr and a max load of 5.8 gr. with a 125 gr XTP. That gives you a 800-950 fps range. Power pistol looks like a much better choice frankly. If it were me I would be starting with 6.1 gr of power pistol (because I have a ton of it) and start working towards the listed max of 7.5 gr. Start load for PP is 5.4 gr (800 fps) and 7.1 gr (1050) fps.
I have found that it is incredibly common to find conflicting data like what you have presented here. There isn't always an obvious reason. I like the hodgdon set your sights on reloading web site because it actually lists pressures and velocities. This is especially handy if you have a chronograph. Every manufacturer wants to make their bullets and gun powder look better than their competitors too. I think this creates conflicting data some times.
Thanks, I'll look at that.