Re: Ring question for the pros
You'll probably get different opinions about this, but the best thing to do (IMO) is to stay with top quality parts. For bases and rings I like Near, Seekins, USO, Badger Ordinance, and Nightforce. Forget the cheaper stuff, and focus on top quality.
I had a problem some time ago with some aluminum rings on a rifle that traveled with me (trunk of car) for thousands of miles, months on end, and I had some POI changes with it, over time.
I attributed this proble to differences in temperature and the use of those (Burrus) aluminum rings on the steel Badger Ordinance base, because changing to a set of Badger steel rings solved the problem completely.
After further consideration, I am convinced that the material did not cause the problem, rather it was likely due to the cheaper construction of the Burrus rings (i.e., not as precisely machined).
If I'd changed to Seekins rings, it is equally likely that they would have solved my problem even though they are an aluminum alloy.