Upside down on a granite island top, with the front bead off the edge, always does the job for me. For a surprize, try lining up three or more guns at the same time and sight down the long axis from the butt ends. Small amounts of twist and cast become apparent that aren't readily noticeable looking at one gun only. Look across the guns at the buttplate and you can see the differences in pitch. Then you realize why some guns just seem to fit better than others. Best.
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