Measuring cylinder taper with feeler gauge and ring.

Has anyone here done this? what is the no go spec? i am thinking .010 (difference between top piston gap measurement and bottom measurement) is "too much" What say you?

Also to clarify , I what I mean by "done this" Is measure cylinder taper with a piston ring and feeler gauge. You put the ring in the bore just under where the ridge may be (where the ring actually contacts bore) take a measurement, record it, then measure at the bottom ,where the ring doesn't ride .subtract the bottom from top, and note the measurement. I am saying .010 is too much using this method. , then you should overbore. Of course bore gauges are more accurate but who has 4 inch bore gauges ? :)

This is purely just to tell if you can hone and ring or does it go to machine shop.