New Jersey has always been shotgun only so here is what we have found.

12ga is the best all around gauge

Rifling is preferred for barrels.

2 3/4" or 3" both work well but many of s stick with the 2 3/4" due to less recoil and good accuracy out to 100 yds. The extra power of the 3" doesnt always mean much when most shots are under 50 yds.

Scopes help a lot when tree stand hunting is the method.