But if you were tracking a wounded grizzly and I was backing you up, we'd probably both feel better if I had something with a bit more muzzle energy that a .30-30.
Of course, but that is a totally different story...in that situation I do not even want to have a 300 Wby Magnum with 180 grain bullets to be my backup.
A stoutly constructed, slower moving bullet with extremely high SD would be my choice....if limited to a 30 cal. class, a 30-06 with 220-240 gr. pills. would be my choice