I know a bartlien sporter weight #2b fits a factory inlet mod 70 win just fine. For those that have done it how much inletting is required for the #3 contour? I am considering a #3 sporter 29" blank, and cutting an inch off of the shank to move it back and help the contour fit the factory inlet. I think i will have to open the barrel channel a little. Did it work for you?