Jesse Ocumpaugh out of Oregon will rebore a Marlin 30-30 to 357, 375, or 444. I think he recommends the models with a forend cap versus the ones with the barrel band for conversion.
The Marlins are a lot rarer with a little over 2400 of them made.
More winchesters were made but they are not that plentiful either. I've had 2 winchesters in 356 and one in 307.
I had a Marlin 30-30 rechambered to 307 by Nonneman but factory loads tended to stick in the chamber but reloads worked just fine. I think thats why Marlin never brought it out in 307 and the newer 308 ME case is shorter and works at lower pressures than the 50K 307 ammo.
Kinda moot point with the 308 Marlin Express out but remington/Marlin is not making any more of those along with the 338ME. The connecticut built guns bring a premium over the Ilion guns.
I would have gotten one of the Winchester's in 375 but have yet to see one in an angle eject model and I put scopes on all my rifles.
