The very first post pretty well summed it up. Old school cartridges. If it’s been around for a hundred years then surely it’s antiquated, obsolete, weak, and inferior (per most folks). Reality is that the rounds would not have lasted this long if they didn’t work, and work pretty well. 30-06, and 30-30 are the first two that come to mind. They have been filling freezers for decade after decade and will do so for the foreseeable future until guns are no longer legal to own or use for hunting purposes.
The 3rd one I’m putting on this list is hugely controversial, but it is one wrestled with by almost every hunter at some point in life... 20ga. No it’s not a showstopper powerhouse, nothing truly is, but the 20ga can do everything a 12 can do, especially now that modern powders and modern chokes are doing what was impossible a few decades ago. From quail to turkey, squirrel to moose, a 20 will get the job done with proper ammunition selection. Slugs are arguably as good as a 12ga so it is at no disadvantage for big game unless your talking 3-1/2 magnum 12 or even 10ga slug, but those are very rare to see, and even rarer for them to actually exceed the 3” velocities and performance. Small game is small game and it can be nice on Turkey to have 200 pellets flying rather than 140 but realistically it will flat work... but we all struggle at some point in our teenage years with moving from a 20 to a 12. Ever ask why you needed a 12? Because it’s better than a 20 is the standard answer, but a 20 realistically is 99% as good as a 12.
