Your rifle has the most common throating. Almost nothing.
If you choose the LCFN, I reccomend a 250 gr, because the nose is long on this bullet and it needs lots of bearing for top accuracy. In this weight the ballistic coefficient will probably beat any other 348 bullet available, jacketed or cast. If you choose a weight between 200 and 230 gr, get the LFN, which will be most accurate because of it's longer bearing surface, yet will chamber easily with gc inside the cartridge neck.
But 200 gr will will kill deer and black bear as quick and clean as the heavy weight at ranges to 150 yards or so. By this I mean that expansion with air cooled wheel weight metal will be cartain out to that range, if velocity at the muzzle is at least 2100 fps or higher. -- Because of the high B.C. the above LCFN would probably expand reliably out to another 100 yards with the 2100 fps start velocity, or if run at max velocity, which would be 2300-2400 fps if LBT bullet lube is used, the bullet will probably expand reliably out to 350-400 yards.
From the above, you, and other readers, can make the best determination based on how you intend to use the gun, how much recoil you want to take etc. I will add, that probably the most flexible bullet so far as all types of use in the lower 48 states, to include plinking and general playing, with capability for all game found here, would be a 225 gr LFN.
You didn't mention bore diameter, and it isn't a factor until I set up to cut the mold, but .350 diameter will fit and shoot best in 99% of the 348's I've measured. And I've measured a lot of them. So if you just order that diameter, you'll have a mold suitable for almost anyone's gun, should you someday want to supply a friend with bullets, or purchase a second rifle.
