Pattern Board
It is a 4’ piece of 1/4” steel with a flat washer welded in the center which allows for a focal point as well as an anchor point for a homemade protractor that I use to mark the 30” circle.
Use white lithium grease and a paint roller to clear the plate for the next shot.
Board has worked out well but is not good for steel shot patterns, that would not be very safe.
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