OK, it's not a lever action, but it is tube fed. I've developed some interest in getting one that's 100yrs old shooting decent. Towards that end I slugged the bore the other day, made some good impact slugs of throat and muzzle. I had to clean what had to have been nearly the whole 100yrs worth of carbon fouling out of the barrel first.
The throat of the rifle was still very short, the lands very sharp. Rifling was 7 groove, 1/12 twist. Lands were only about half the thickness of a Krag's lands and the grooves were gently rounded from the tops of the lands down to the bottom. Bore measured .303" and groove diameter is .3105-.311", with the absolute back of the throat being .312". With an odd number of lands and grooves I had expected the larger bore and luckily ordered one of NOE's 311440 molds with the larger .303 nose.
I've been forewarned by a fellow who works on 14s and 141s exclusively that cast bullets are a no no, so I just have to make it work. The 311440 has a large meplat and comparing it's dimensions to the throat slug, appears it ought to fit and feed fine, long as the bullet's hard enough to take the beating in the tube. If ever a bullet was designed specifically for this rifle, this has to be it. Considering the fact that the rifle was much used by the folks at home during times that jacketed bullets couldn't be had, it might very well have been designed for the Model 14 by Ideal. I also have NOE's SAECO 315 copy with a .304" top band coming. It might work, depending on how the .17" meplat works in the tube.
I had to shoot up some old Remington ammo the other day to get reloadable cases. I noticed that old ammo, made in CT had a .303" diameter band about 3/32" tall ahead of the crimping groove to lessen the jump before the bullet received guidance from the rifling and they don't have far to jump at all. Newer ammo, made in AR didn't have this band. Didn't have time to compare the two, but wasn't happy with the 50yd accuracy of the bullet with the band. Might have held 3-4". I can do better than that with some of my smooth bore slug guns!
Judging by the sharp lands, short throat, and outside condition of the rifle it has probably been carried more than it has been shot. The muzzle needs recrowned, appears to have some cleaning rod wear, despite being a takedown model that can be cleaned from the breech. That probably didn't help the accuracy of the undersize for the bore bullets.