Ok, I bought an H&R in 45/70
I slugged the bore with a lead sinker
even push from the muzzle to the forearm bolster (??)
then it gets stiffer, but evenly stiff to the breech
I then slugged the muzzle using an impact technique
then slugged just ahead of the chamber using an impact technique
I get roughly the same measurements on all three slugs
.455/.459 or so...
I don't see anything in the bore to cause the stiffer push though.
is this rifle a candidate for firelapping? (I think so)
also, is this shallow of rifling 0.002 common on these? I'd not read that before.
it is 8 lands w/ RH twist. lands are (aprox) 0.070 wide. grooves 0.113 or so.
I need to yet do an impact slug for the chamber dimension.