Originally Posted by Kris C
Have not checked the inner diameter. What tool would you use for that?
Best thing I have found is a set of pin gauges from CDC tools
CDCO Machinery Corp.
for $55.00 you can get machined pins from .251" to .500". They will tell you a lot about inside dimensions and are particularly useful for finding do-nuts and partial do-nuts and gauging springback.
In my dealings with Lee they insist that the low bullet grip of .001" to .002" is essential to keeping runout down. I have ordered undersized mandrels from them for $5.00 each and with the one that is .003" less than caliber I did not find any additional runout, bullet grip improved and group size stayed the same.