I have a few Model P revolvers. I asked Cimarron what the max fps is. They wouldn't answer that, but told me factory loads that aren't Plus P, or high power. I see about 920 fps as the highest standard load I can find.
It's a beautiful revolver that deserves to be shot at the range. If you wanted a hotrod, a Ruger, a T/C, or Dan Wesson would have been the way to go. There's nothing to apologize for when it comes to punching paper with mild loads.
I've always considered Hercules reloading data in the "moderate" range. This 1983 manual lists the 45LC, with a 200 grain jacketed and a 250 lead:
I think "velocity" is the wrong question; rather, C.U.P. is what I'd be looking at. I'm seeing the 45 LC maxed at 12,600 C.U.P., right in the same territory as the 44 Special.