Got one of those Meta Tactical carbine kits for a G23. It has a 16" barrel. Suggestions on ammunition?

I have some 150gr Underwood rated at 1300fps on the label (no doubt from a handgun), 165gr Ranger-T, and 180gr HST. Now speaking solely based on "air flight" characteristics I am leaning towards the 150gr Underwoods, as a mid-weight bullet probably breaking 1400fps from the muzzle with the longer barrel (purely a guess) would "fly" with a flatter trajectory than a heavy-for-caliber bullet. Then even once downrange at a reasonable distance (maybe 100y or less) it would still have a head of steam for impact.

Thoughts?