In the UK one is weighed as part of getting the medical certificate so the CAA know how much you weigh. Those are the scales that matter until it all goes wrong and you get weighed again in hospital or mortuary.
The limit is just that. No leeway if it is in the 'limitations' section of the POH ( I dont know if it is - I dont have a POH to hand), so it is sensible to be a few pounds under. From a 'comfort' point of view I would rather be quite a bit under the limit or go for a different helicopter.
Oh, and dont store anything sharp under the seat if you do go for a 22
Hope this helps.