lee enfield scopes holding zero

I doubt it is the scope that loses zero; it is far more likely to be the rifle that moves its POI over time. Why would any scope "move" unless you move it, or unless it is actually broken. A wooden stock, however, will change with time, moisture, temperature, etc., and change POI quite easily. Enfields have very "complicated" stocks.
 
Rifles changing point of impact from one shooting session to another, is most likely caused by the scope mounts.
I have found this with every rifle, including 22 rimfire, that I had side mounts on.
Good bases and rings, and that includes Weaver, bolted solidly on the top of the action, as far apart as possible, holds from year to year, for me.
In my case though, they are always on a rifle which has been well bedded, so there is little change in the rifle over reasonable time.
 
i think a lot of the problem lies with the Weaver TO1 base that many use to scope Lee Enfields at least the No 1 Mk3 type. The mount is held by three screws, two in the receiver ring and one on the charger guide, which isn't a problem really. But the TO1 base is really a .22 base having standard dovetails and no recoil lugs that the regular Weaver rings can lock into to prevent the rings and scope from creeping forward under recoil. You must use one inch weaver tip off rings with no cross bolts that act as recoil lugs, again .22 rings. I experienced this problem a few years ago and went to the old Parker Hale bases and rings, hard to find but a good rugged system. A friend of mine uses the TO1 and one inch tip off rings but drill and taps a 6-48 screw hole in the base adjacent to the ring where it clamps the base. This prevents the ring from moving forward but seems Mickey Mouse to say the least. There are a few guys on here who are old hands at scoping Lee Enfields and they will chime in shortly. But I have had no issues with movement or change of POI after getting a decent mounting setup.
 
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