Most folks forget that when the .30-30 was introduced, it was touted as the latest and greatest, fastest whiz-bang cartridge ever invented. Good for everything from prairie dogs to grizzly bear. And, it's taken all the game on the North American continent.
I've got three and I've never felt undergunned with a .30-30. I may have to slip up a little closer, but if you stick a 150-170 grain bullet betwixt the ribs, he's probably going to blow blood out of his nose and fall over in just a few steps.
Yeah, I've got other rifles, but come the fall and the whitetail season, you're just likely to see me with a .30-30 in my hands.