Why, I used weaver bases and medium to clear a Bushnell 3/9X40 on a Featherweight. I can always use low on my post 64's, and I found the ocular bell if it's large like on most modern scopes, there's not enough clearance for the bolt. .........just checked mine to confirm, and even with medium my bolts rubbing on my scope ocular bell. Oh well I guess it's high for me too! In that case the 3.5X10X50 will go on for Cotes. Good luck.