I run .050 on everything except my 084 which has .063.
If I acquire an .058 or .063 bar and/or chain it goes on the next saw I sell, or it just goes period.
Having all those different gauges just adds another area for error when you get out in the woods.
It SUCKS to have an extra, well sharpened chain with you and then find out that it is the wrong gauge!
Mike