Ok take this advice from a self proclaimed "expert." I conducted allot of research and talked to many people in the business about choosing a 40 S&W duty round. I settled on the 165 grain (take your pick, hst, sxt, GD, GS...) The 180 grain was a very close second and I'm not sure about the decision. The 155 and god forbid 135 were not even considered. The faster bullets are very tough on the guns and the shooter and they will effect your follow up shots, period! Truth is the 9mm, 357 Sig and 40S&W are almost identical in performance, in testing, with good quality SD ammo. The Federal HST round is the only one I'm aware of that stands out and it that case the 40S&W really shines. Try the 180 and 165 and decide for yourself based on your shooting with the round. If the local shop doesn't have the one you picked then go with the other one, they both work very well.
Maybe you got some Border Patrol ammo, they just switched to a heavier round.