FWIW, I bought one of the Pedersoli .45-70 doubles. It had bores which looked like they had been gnawed out by rats - very rough surface finish on both lands and grooves. To frost the cake, the groove diameters were too tight (.4555", or so). To be fair, I shot it - it keyholed within 10 rounds at 70 meters using the ammunition Pedersoli said they regulated the rifle with - Winchester 300 gr.
I was not amused, and contacted Pedersoli to tell them so - they were unimpressed, and, in essence, washed their hands of the matter.
I contacted one of the distributors of these rifles, who was kind enough to send me three more sets of barrels, which were each and every one as nasty as the first.
At that point, I gave them up as entirely unacceptable, and I really wanted one.
Caveat Emptor!
mhb - Mike