I have a set of Enco pin gages which are very helpful to measure revolver throats.
Lately I gave some thought to other uses for them. They could be used to measure H&I sizing dies to check diameters and I also believe you could use the appropriate size pin to enlarge a sizing dies also.
After further experimentation, I will report back and let you know how it goes. I have a .4305 size die that is slightly out of round. I plan on enlarging it to .4315 or maybe a little larger.