I've had this rifle 20+ years and got it straight from Sweden. Its one of the "sporter" or chopped m/1867 long rifles. I've put a lot of time into this one getting it clean and sharp with minimal expense. Though I've shot this rifle I've not gotten an accurate bore & land measurement. Until today.
Pin gauge shows .477" as the land diameter.
Used telescoping gauge to measure groove diamter.
Shows .499"/.500" for groove diameter.
That makes for .0115" depth of groove.
I've shot .512" cast and .500" Great Plains muzzle loading slug. In the future I'll size everything to .510" as I have a Lyman lube die in that size. For light smokeless rounds I'll use White Label beeswax-allox-carnuba BAC lube.
This is an easy cartridge to load for the rolling block once your .348 Winchester brass is expanded and annealed. There's no real good reason to have these rifles re-chambered to .50-70 Gov't. Its a toss up since .50-70 brass is available from Starline. If I had to do it over again I'd probably go for the .50-70 only because of brass availability.