Hey all. Been doing quite a bit of shooting in the last week or so since I bought an HK USP40. I'd really like to know how to measure group size. This pistol is superbly accurate, actually very surprising for a "service pistol". So how about it. I put those 3" shoot-n-c targets on the back of a paper target and at 25 yards offhand I had one 3" circle with 13rds through it.