I tether all of my AF guns. I usually get no more then 5 fps. Most of the time it's less then 3. I have 257, 308, 338, 375, 45 and 50. If your getting wide spreads it's the firing consistency. Took 2 shots last night with the 50 with 400 gr and it was 939, 938. Thats 3500 psi with 29"...