As I'm sure previous posters to this thread have opined, and I'm late to the thread, just buy ANY flavor of Federal's HST (in the 50rd LE box - NOT the ****** OVERPRICED 20rd retail box). I'm new to this forum & my 1st single stack, a Shield #10086. I've carried Federal #P9HST4 147gr +P in my my Steyr dbl stacks (3.6"-5.0") for the past 4 years with absolutely ZERO malfunctions. Put 500 rds - including 100 rds of #P9HST4 - through this puppy over the past couple weeks with the same result. Zero, ziltch, nada malfunctions, it eats everything from FM 115gr remans to the HSTs, happily! As far as I'm concerned, an 8+1 HST load in a Shield (or any other pistol) is the perfect Minute of Badguy for defensive pistol - BAR NONE...! Check out Ammo Quest\youtube for his 3" barreled FBI test comps and ammoseek.com - I just picked up 500rds from bonefroggunclub.com (NV) for $0.3971/rd with s/h ($18.25/50rd box before s/h). Oh, and NO, the 147gr +P HST isn't noticeably more snappy than my 124gr FMJ range ammo... Hard to tell the diff when my buddy candy-canes the rounds for me.