I am a bit confused with my new PRO Chonograph Digital. It seems to read velocitys approx 100fps slower than my Chrony F-1. (That met an untimely demise) Here are a few velocitys that were chronred on the F-1 and the Pro Chrono. 308win- 26"bbl, 45.5gr Varget, 175VLD F-1= 2750, PC= 2650 308win- 26"bbl, 45gr Varget, 175smk F1=2725, PC= 2625 2-223Rem- 26"bbls, 25.5gr Benchmark, 55gr BK F-1= 3350, PC=3250 7mmRemMag- 28"bbl, 63gr RL22, 180 VLD F-1=2975, PC=2870 I never chronoed the load below on the F1. 300wsm- 29"bbl, 68.5 RL19, 190VLD PC= 3000fps I then tested a friends 308win: 24" bbl, 45gr varget, 175smk PC=2560, I figured it should be 2650-2700. I used the 7mmRemMag and the 308win @ 800yrds 2weeks ago and they both supported ballistic charts that I made with the data from the F-1. Anyone had a problem like this before? Which one should I believe? Im guessing the F-1. Any help would be greatly appreciated.