I like my TX's to run around 10 fps total spread in 10 unweighed shots. They don't always do this, but usually are close. I have one that will shoot as close as 4 fps spread with a SD of 1, but again not always. I tried a HW97 recently intendidng to buy. I put it over the chrony with Crosman Premiers and found it had a 2 fps spread in 20 pellets. Simply amazing and I had to check the chrony several times to see if it was working with so many pellets running the same fps. The only problem was that with a 1,000 shot practice over a weeks time, the gun simply would not group better than 1" at 25 yards. Many groups were much worse and all pellet types I tried showed the same results. I didn't buy the gun.