It may seem that an expander plug is on the large side as it tends to stick inside a case on occasion.
We have found several reasons for this to happen. On many occasions, this happens with new unfired brass cases.
The brass is so clean it literally bonds to the steel expander as it rubs across it. We have found polishing the expander will help along with using some LEE Resizing Lubricant in the case mouth, a little on every 10th case, makes a big difference.
Nickel plated cases have also been a problem on occasion as the nickel tends to make the case mouth smaller, and the plating tends to build up at the case mouth. Taking a chamfering tool and breaking the inside corner of the case mouth will help.
This tight fit can also create a problem with the Lee case activated powder measures, making it appear as it is not flaring the case mouth as it should, but yet it actuates the powder measure. This is just the condition of the Powder Through Expanding Die not being set deep enough. Just continue to turn in the die a ¼ turn at a time until the flare appears.
No case mouth flaring. Remove the expanding plug from the die. Insert it into a case. It should start to enter, but get tight before it gets to the expanding section of the plug.
