I contacted the company in Italy via e mail and they wouldn't provide the information. One of these days I'll send some off for testing. The 20's are 2 3/4 not the 2 1/2 inch I thought they were. It's nice not to have to load shells 
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There is no hunting like the hunting of man, and those who have hunted armed men long enough and liked it, never care for anything else thereafter...Earnest Hemingway
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