What rifle is this?
IMHO the most important readings are, but not necessarily in this order, average FPS, spread, min and max.With these readings, you can check the health of your gun. You want the spread to be a close as possible and the average deviation to be as small as possible. You also want the FPS of your gun to be in the range of others of the same make and model.If these figures start to get lost, it is a sign the gun need to be freshened up a bit.
Tony,if shot #1 @ 768 fps is your first shot from 3000 psi you should reduce hammer spring tension. Right now you have a downhill velocity curve. Starts high and ends low. What you can do to shrink your extreme velocity spread is to start at a lower velocity for your first shot rise up to a peak at your 16th shot and come back down to a velocity close to your first shot velocity.Once you get that we can work on squashing your peaks with transfer port restriction to decrease your extreme spread.What rifle is this?Thanks,Taso
I think joe will say 3000 fill is on the downhill side of the bell curve, it hadn't reached its full potential velocity yet. As a manufacturer and seller, he can't suggest filling over the 3000 recommended for the gun (although people do) my mrod is set to a 3100psi fill for 70 shots. But By adjusting the sweet spot to a lower psi by making the hammer to hit a little harder by either the spring preload, or by having the hammer strike the valve stem later (more inertia) you will find as he said your first shots climbing in velocity, then flattening out, then gradually. Falling.