ORIGINAL: HuntAway
The most nervous I have been when shooting a ML was when I sailed 5 bullets through my chrony @ 100 yds to use as confirmation against these calculators.

Thinking to myself "Please don't have a flier."[:@]
The chrony survived and as it turned out the "numbers" were pretty close +/- 20 fps.
That is good to know, with good chrony and accurate BC, should be pretty close.
Chap