Originally Posted by CliffM
Do you think it is possible to not have it opened all the way and have the eyes looking a bit inward (that would be crosseyed). I have discovered mine lying from time to time and this makes me wonder if not setting it up the same every time could be it.
All I can tell you is that setup with the Chrony's is critical. I like to run 2 chronographs back to back to give me a warm and fuzzy feeling.
With the one F-1 that I have I can only tell you what I do to not get frustrated.
1) I set up the F-1 at a minimum of 15 ft. from the muzzle of rifle - and I measure this with a tape measure, make note of it, and after a session I plug into ballisitic calculator to get true muzzle velocity. At 2800+ it usually adds about 7 fps to actual reading on chrony with 168 Berger VLD's on a .284 bullet. With a heavy boomer with brake I set up chrony at 20 ft. from muzzle..
2) I bought an old style folding 3 legged surveyors tripod at a pawn shop (20 bucks) that is sturdy as all get out and adapted a bolt/nut to tripod head to fit my chrony. After setting up chrony the correct distance I want, I level it both ways with a 6" torpedo level. I think since I started doing this it has made a world of difference in that I can't remember the last ERR reading that I got.
Having a very solid base (tripod), keeping it far enough away to prevent any muzzle blast having an effect, and getting it perfectly level has now allowed my cheap chrony to run right with some of the more expensive units.
I would encourage you to send your chrony back to get re-calibrated if it is truly reading high/low. They are good people to work with and it only cost me postage one way. Keep in mind that these units are acceptable if they read within + or - 3%. For me that is not acceptable as plus or minus 3% of 3000 fps is 90 fps at it's worse senario.