At close ranges, think of your 12 bore as a 73caliber rifle. Shot placement counts. The more spread you have the less effective your hits. Close in with a nice tight pattern you can STOP a bad guy with a load of M&Ms. Out at thirty feet if you hit him with only a couple-three buck pellets you may hurt him bad or you may not. If the whole load gets him in a tight group your chances are better and his are worse.
The A&W spreaders seemed to be effective for giving an oval pattern and had the added benefits of reducing recoil and increasing shot velocity by bout a hundred fps or so. Like bobs1066, I haven't heard anything bout them since the 70s.
Sam
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