Axiom Home Page Forums General Discussion Home Theater QS8 Wire length to gauge question

I know the rule of thumb is to use 12 gauge for runs over 50 feet; however, does that apply to rear effect speakers like the 6ohm Qs8's? I don't want to have to undo all of my speaker wire when I get the Qs8's. They will run 52 feet of wire for each, and I currently have the Monster XP Navajo White 16ga. speaker wire. Will that work for rears, or will I notice a difference buying the Axiom 12 ga. stuff? Thanks.