Shooters will be allowed five (5) grains for scale differences.
The two pounds is at the top of the weight range. (re:80 #)
That is the allowance. The 5 grns. Already built in.
Because we all know that scales are not exact from one to another.
BUT, the ones on the range have been adjusted to a certified weight at the shoot. I would suggest that not very many in basements or shops have had that done recently, if ever.
By-passing all that, the scales where you are checked are official. Variables are built in with the five grains. The bow scales are checked and calibrated. The grain scales are calibrated. If a shooter pushes it to far we all know the result.
My best advice is to give it some room. Don' t go there. It ain' t worth it.
ken12

Ken,

Who owns the scales that are being used at each shoot? If the club owns the scales would it be possible for the IBO TO buy some good certified scales and furnish them at each shoot for that shoot to verify that the limits are being followed. One set of scales (or what ever it takes) would be a solution and certified scales would leave no doubt. A good set of scales could be adjusted when necessary and should eliminate any problems. These scales if used at each IBO shoot would be the final answer with out question. In most states the bureau of weights and measures is the final answer.

I am sure that the IBO can come up with something that will make it that makes this rule 100% without question understandable.