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there is a brace that is not shown in the picture that prevents twist
I have practised with it in several modes until I know I can get consistant measurements in different settings.
along with a Skeets bore gauge, a scale, a tape and a caliper (not in the pic) you have a compact set of tools that will give you some level of confidence when you consider a gun.
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"If there is a heaven it must have thinning aspen gold, and flighting woodcock, and a bird dog" GBE