Rev,I did not plan to shoot the two previous chronographs I owned either.
Do not worry about the light,the wind yes and your rifle also.
I chronograph the picked load at least twice and the readings are usually not that far apart. For instance,the .35 Whelen (55.0 grs Var-Get 250 gr Kodiak bullet,Fed 210 Match primer from a 22" barrel) load the first time over the chrono was averaging 2480 fps for three shots,the second time,the average was 2472 fps for three shots. End of the chronograph that load.
