Sam,
Sorry I didn't see this sooner.
It means that 10 kilograms is the magic number. 22 pounds is an approximation for those of us still used to thinking in imperial weights, not metric. If you go look up the conversion, 10 kilograms = 22.046 226 218 lbs... or approx. 22lbs ;D
You'd be well advised to keep it at least a quarter pound under the limit unless you have a really good reason otherwise (and in F/Open, with a 22lb limit, there ain't many). Variances in different scales, adding things like mirage bands or rain shields (which people conveniently 'forget' to have with the gun when they weigh in, though they'll damn sure remember to pull the scope caps and turret covers...), etc. can put you over the limit all too easily. Depending on the configuration I've ran as close as 0.05kg (~1.8 oz) but a) I have the same scale as the guy weighing the rifles and b) I weigh it the way I shoot it, period.
Monte
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