What is the largest thing a red ryder bb gun would kill in one hit to the chest?

You can hunt grhoppers as I,in my Red Ryder days.They sunned on the sunflower stalks in late fall afternoons and it was great fun in honing my shooting skills. No excuse but that same boy nailed a few black birds that nested in the neighbors eaves much to the encouragement of the neighbor and the forbidding of my Mom. Rita Wants me to shoot them. Well don't you dare. I dared when Mom wasn't around.