Quote Originally Posted by Jim Tarletonicon View Post
All 48 Lyman installations I have seen are drilled all the way through (I have 6 03's with 48's).
I can't imagine a blind hole in the side of the rear bridge of an '03 action having much more than one thread of contact - you'd want all the contact area you could get in any case. Come to think of it, I don't think I've ever seen a blind hole for a receiver-mounted aperture sight.