My mod M-42 is as effective to 25 yds as any larger gun I have. Chuck, I pattern tested Rem 3" against Win 3/4 oz 3", and found the Remingtons to be both tighter and considerably faster. I think a full choke gun might be just the thing for the Winchester load, but haven't tested it on paper yet.

You might want to pattern test a couple/few different loads to gain insight into why the Federals worked so well for you.

Sam