Chronograph problems!

[scsims]

I beleive that my chronograph is not reporting correctly. Because everything that I shot through it is lower than the load data. Most load data I look at is using a 24" barrel and mine is a 26" and all of my loads are about 150 to 200 fps slower than they have for the shorter barrel. Could it be that I'm shooting too low or high above the chronograh or that it is too close or too far from me. Any ideas guys?

[:(!]Has anyone else had problems with their chronographs not working correctly on sunny cloudless days?

[Larry Carter]

Long time since I used a chronograph but I know light and screen placement can be critical on some brands.