If i had correcly understood what you mean. ssj, you want to use a no.5 micrometer sight on a No.4 rifle? i just do it withouth any problem. But elevation doesn't match the range written in sight, because no.5 rifle has a shorter barrel and bullet exits the muzzle more slowly. So you could use it on a No.4 but expect a process of trial and errors.

---------- Post added at 04:30 PM ---------- Previous post was at 04:29 PM ----------

And ...yes, Sir.Peter knows about enfield more than any other.