Looking at a pedersoli baby rolling block in 44-40.
But wondering what the true bore diameter is. All the info I can find on it says the same thing.
(Cut rifling .004" deep, 1-36" twist, 6 lands measure .424" and 6 grooves measure .432".)
Is it me or is my math wrong? if you go by the .004 deep rifling from the .432 that gives you .428.
Or .424 lands, .004 deep, gives you .428?
Any one own one of these that could verify the bore diameter? Confused!