I have a model 200 in .308 win all factory and just installed a new barrel on my model 12 in 308 win. When I head spaced the new barrel I used the go Gage and then added a piece of tape to the Gage and the bolt will not close. now when I use the same Gage and tape in my model 200 the bolt still closes.. Do I need to add more head-space to my model 12 with the new barrel or what?? don't understand why the difference in head-spacing