Yes I once had a Ruger No.1 in 7x57 on which a very bad gunsmith put the scope I delivered in Leopold rings. First I hated them because they were much too high for the 40 mm objective but they also came loose very quickly.
My very first rifle though was a Ruger No.1 in .338 Win. Mag. but the scope was mounted with Tasco rings, "Made in Japan" and they fitted perfectly and never got loose !
So I guess the problem is bad tolerances in producing the rings. Now I use EAW or Recknagel mounts and rings exclusively and never had problems again (if the gunsmith does his job well).

Kalunga

Wicked good hunting !!!