From the factory, 40-50 seems normal. They have the potential to achieve 1.5-2x that at 11.0-11.25ftlb if carefully tweaked.

I tweaked mine. One of mine started with low-40s and the other mid-50s, but with careful, patient tweaking they almost doubled.
I also removed their anti-tamper while at it and replaced with old-style internals.

Here's a graph 'before and after' for one of mine - red before tweaking, blue after, shot number along x axis, pellet velocity along y axis:
I'll probably be selling in a few weeks time but at the moment they're in the loft, dusty, with some rust on the barrels and haven't been used for a few years so need checking over before I can advertise them.