Thank you, Kuduae. Yes, nearly identical! Did I read somewhere that Dixon allegedly made many of the Scottish rifles, thus the similarities?

I slugged the bores about 2 inches deep into the muzzles... 7 lands, RH twist. Wide grooves - lands are only about 1/3 the width of the grooves. I could measure the slug across the grooves - .459. The grooves are .007 deep, measured straight across from the opposite land, thus .445 bore diameter? The bullets I have are .451, paper patched up to .463. Too big?