More deer have been taken with the .30-30 than with any other cartridge existing. Ditto black bear. There's a reason for that and it's not sophisticated advertising.
In addition to .30-30, Marlin sells their 336 in .35 Remington, which should do just about anything walking in N. America.
If that isn't adequate, Winchester is now making the 1886 in .45/70 and the 1895 in .30-40, .30-06 and .405 Winchester. All good rounds, although the .405 might be harder to find if you run short on a trip in Moose Nose, Manitoba.
You can also get older Winchesters in out-of-production but by no means inadequate rounds like .32 Special, .38-55, .303 British and such. Any of those will put Bambi in the pot without a problem. A used but solid one can be a real bargain and ammo is still around.