Yes I live in VA. I am actually going to the last chance N-SSA shoot this coming Sunday in Capron, VA and am going to join. I won't be shooting but will be asking questions
Well welcome to the madness.
In the world of reproductions, bore size is never, ever standardized to any reliable extent. Doesn't matte what it's marked, you have to measure with some form of PIN GAUGE. This problem leads the unsuspecting to just plunk any old minie down the pipe cuz that's what the barrel says and said commercial minie will have been cast from suspect range scrap and is probably way too hard and our novice will use Pyrodex and Wonder Lube and the resulting keyholes, inaccuracy and frustrations will lead them to plaster the internet with "why these guns are manure, yada, yada yada.
Like
@maillemaker and others have said, a venier or dial caliper will not get you an accurate measurement. Since you're going to go to Capron, take the rifle with you and I'm sure somebody will have a set of bore gauges. There was a N-SSA member who recently had some made and sold them to the N-SSA members and I bought a set. Very handy to have.
As for molds- Lyman, RCBS, and Moose. Forget Lee. I have never seen a Lee last any length of time in a minie. There isn't enough aluminum there for the amount of lead you are pouring and the core pin is held in by a piece of sheet metal that will flex and the entire unit is subject to warping and galling of the aluminum. Even if there is an unconditional guarantee, you'll be struggling. Since you're going to join up, ask around, most N-SSA members are more than willing to help new folks get their musket up and running.
Getting one of these critters to shoot well isn't rocket science if you follow the basics- real black powder, pure lead, correct size minie, good lube, RWS or Scheutzen caps.
Navy Arms 1863 Remington aka "Zouave" 10 shots rapid fire offhand at 50yd. That's 9 pigeon hits out of 10 shots as fast I could load and fire. Minie was RCBS Hogdon