Velocity Problems

[slateman]

Got a problem with my velocity. I was at the chrono and I shot over it. It said 342. No problem, I'll turn the nut to the left. I turn it and fire. It reads 363. I turn it another quarter turn and it drops to 140. I ended up turning it up milimeter by milimeter until I got it to 260 (field limit is 280). Does this happen to anyone else? What's the deal?


One side note: The chrono station had two chronos sitting next to eachother about two feet apart. Could this affect the readings?



P.S. Notice my new sig

[virus]

when you goto chrono in... anytime you make an adjustment to the FPS on the back of your valve turn your marker sideways and fire off 4-6 shots, so that the regulater cant reset itself to the new pressure.....(this holds ture to any marker that you use a reg to adjust the velocity)

after you do these "clearing shots" fire a couple over the chrono you should see that the velocity is more stable....