The winchester HS hull uses a specific wad for that hull and I don't know if cutting it from 2 3/4 to 2 1/2 would change that. I use the Galandi wad in my 2 1/2 20's. Why do you want to put 1oz of shot in a 20??
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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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