Never seen a reason to buy Underwood ammo, there are better choices for 9mm and 40 S&W than Underwood IMO...Speer Gold Dot, Federal HST and Winchester Ranger ammo come to mind. There is the misperception that driving bullets "really fast" will cause them to achieve better incapacitation times; however, factory JHPs have velocity windows set between low and high fps. Exceeding velocities faster than a JHP is designed for often diminishes bullet performance by over expansion and/or bullet weight loss limiting penetration. FBI protocol for accepted penetration in 10% ordnance gelatin (soft tissure) is between 12"-18"; as an example, overclocking a bullet's upper velocity window can result in penetration in the 8"-10" range.
I use Double Tap all copper Barnes JHP-XP loadings for 38 Super and 10mm, haven't found an upper velocity limit for these bullets in these two fast velocity calibers.