In theory, it should make very little, if any difference. It is the lift or bendiness of the barrel that is being tested and not the rigidity of the fore-end. It's not subject to gravity differently if it's hosizontal or vertical (well, it IS, but not measurably so.......). I've just measured a calibrated slave No4T used as a test bed for other things and it's identical whether V or H
Interestingly, I always test my muzzle lift with the barrel/fore-end vertical, drawing the calibrated balance scale horizontally.Information
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