Those velocities are always impact velocities, muzzle velocity is not important unless you're putting it up against the animal ;D

Don't be too disinfranchised by a .155 BC, very few ML bullets are truly over .2. I'd have to look at my notes but I believe I back-calculated .2 or .21 for the 200SW, and it's one of the best BC out there. Most manufacturers way over-inflate these for ML bullets.

It's not going to be a long-range bullet but I'm sure it makes a wonderful light-recoiling normal range load.