You’re just going to piss off a grizzly if you start shooting it with a 30-30 in my opinion.
That depends 100% upon where you place those rounds.
Sure and you can kill grizzly bears with 9mm pistols. Using a 30-30 on a grizzly would be an act of a desperate person. Just plain stupid otherwise.
Guide I had in the Yukon, when I was hunting caribou, had a beat up 30-30 with 170 grain Remington core-lokts sitting in the corner of the cook cabin and used it (he said) on a few ornery grizzlies over the years said it killed them just fine…..like everything else depends on where you put the bullet.
PennDog