Bob, I really don't know the answer to your question. I had at first thought that you were speaking of the wedges themselves, rather than the lugs.
All the lug inlets I have seen go through to the ramrod hole. It is difficult to keep the stock slim unless the ramrod hole is drilled close to the barrel. Sometimes there just isn't room to make blind holes for he lugs. We make all sorts of compromises to get the forward lock bolt through - just barely enough room in the majority, and whittled down bolts in others.
Also, it is a bit easier to chisel the hole all the way through. Any bottom clearance would be measured in thousandths.
Hope this helps you some.