My first thought is OAL, second would be neck diameter, check before and after the bullet is seated. It sounds like it should be one of those two things.
Fredericksburg is a fun little town, it has grown up some over the last 5 - 10 years. If you are a fan of distilled spirts, I was at the Milam & Greene distillery in Blanco back in January, well worth the visit. If that's not you cup of tea, the Real Ale brewery is right across the street, not...