Before the turn of the century and just after, many target shooters had existing bores bored out to larger size to try and improve on their gun's accuracy. Most of the time, the bores wern't really shot out. Since the .30-30 was a brand new cartridge, and it was smokeless powder, I'd guess the idea behind a .35-30 wasn't a bad bore, but rather an attempt to develope a harder hitting round. I can't see any other reason that someone could shoot out a .30-30 barrel in such a short period of time.
The .32-40 was often rebored to .33-40, and other larger calibers by target shooters. The .38-55 was even overbored to a .40 caliber in an attempt to gain more bullet weight.
With the advent of smokeless powders the gun tinkerers went pretty wild trying to develope different cartridges. The .35-30 you mentioned sounds much like the .35 Lever Power cartridge developed by Fred Wade of Arizona. This cartridge puts a 200 gr bullet out the muzzle at over 2500 fps! Quite a hot round, and surely not for a weak action.
Hope this helps.