I started out shooting Winchester 115gr 9mm ammo through my G17, simply because I can get it for around $11.00 dollars a 100ct box at Wally World. I wasn't to happy with my groups so today I tried UMC 115gr ammo, it seemed to shoot better out of my G17, and at 25 yards I was getting about 2 inch groups shooting from a rest. Previously I had been getting about five inch groups from a rest with the Winchester 115gr ammo. I also tried Winchester 147gr ammo and it didn't fare to well, a little worse then the 115gr Winchester ammo. Anyway, what is the most popular 9mm load in GSSF??????????