My dad has an original muzzle loader he bought in Ohio at an estate sale. It has a 9 pound octagon false muzzle barrel made by B.P. Loar (spelling) with a Joseph Manton lock. It's of a plains design and I believe it's 43 caliber and looks like at one time it may have had a rear flip-up aperture sight. We've only shot it a few times with 70 grains FFFg powder with a heavy patch 40 cal round ball. Who knows, maybe one day I'll have its caliber truly checked and have a mold made.
Bought this little digital caliper on Amazon, shipped, for like $9 bucks. It really is pretty accurate. It has a "zero" button, and an auto OFF. Measures inside and outside diameter, and depth.
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