As you know from my posts, I dont use any chamber gauges. Consider this about your statement though: what if you get a new gun? Say you load up a couple thousand 45acp to fit the tighest chamber you have. One day, a new 1911 follows you home from the LGS and it's chamber happens to be tighter than any of your prior owned weapons. Now what?
I know you load a lot of rifle, and this for the most part doesn't pertain to you, just speaking theoretically here.
If a firearm or a replacement barrel follows me home and the chamber is tighter than SAMMI spec, I will rent or buy a proper sized finish reamer and open the chamber to proper specifications. I out grew having to hand select ammo that would fit each chamber a long time ago.