Generally speaking, the normal ol' paper-patch pure lead bullet works just fine in the .30-30. But ifn ya want a premium bullet get one of those modern marvels with the copper jacket.
Seriously, they perfected the .30-30 technology decades ago. And a soft cored, copper jacketed bullet is probably the best for it. It wasn't until the flatlanders from the big cities started to complain because they couldn't get within 200 yards that they had to invent the super-fast cartridges. But then they wasn't happy with the way the bullets performed at those velocities. So next they invented the premium bullet.
I've heard that some of those high-dollar rounds go "Ka-CHING!" instead of "Ka-BOOM".