I have a Rem 700 LA that I have put together and have been shooting a little. When I chose my mounting base, it was narrowed down to an EGW aluminum base, or a Badger steel base. I chose the Badger steel 20MOA base because I was concerned with the expansion and contraction of an aluminum base being different than the steel receiver. Thermometers use dissimilar metals to move the needle around the dial as the temperature changes. Would it be possible for the same thing to happen with an aluminum/steel situation on a rifle and cause a shift in POI due to receiver flex? Likely, I am over-thinking this. Reason I ask is that I live in the hot and humid Southeast, but occasionally find myself in Wisconsin shooting. My last trip up there I was hunting coyote and it was -5*F.