Ralph,
It does seem a little fast for Unique out of a 2" bbl. You could try a couple things. Most obviously, borrow someone's chrony, or show up when someone else is using theirs. What I'd do first is buy a box of 20 rounds of quality ammo with published specs from a shorter barrel and head to the range with that box, chrony, and some reloads. Compare the outcomes on the same day with the published specs, and your reloads.

I don't know where you are, but you can add a little velocity for elevation and subtract velocity for colder temperatures.

Interesting, let us know what you come up with.