I've seen plenty of big 200+ pound bucks taken with them over the years. That's what I've seen.... now I haven't laid witness to the others, but I'd bet my left leg that buffalo, elk, moose, black bear, grizz, and brown bear have also all fallen to the 30-30 over the past hundred+ years. Believe it or not, there was a time when the 30-30 and 300 Savage was considered "overkill" for deer!!!!