Read my post 670951 where I recommended you "measure" the chokes. Very few posters seem to think that is how you tell. A Winchester bored modified and full will show IC and IM on any choke gauge including a bore micrometer. Winchester chokes are notorious for being anemic. If you don't have this bit of knowledge as well as a bore micrometer, you have no business attempting to buy $5000 Winchesters.