Very hesitant to recommend anything on the double gun site, but very long thread working called "Pattern Theory". About page 4 John Campbell posted some photos of his spreader patterns at 50 feet. He's usually on the 16 G site rarely on double gun, and in my opinion has the best information on spreader loads. Nice fellow too. Most of my spreader education came from his information.
Have a look at his photos, want more search on 16g.com
William
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