Wow, bu5 any gun if it hits just right will be deadly or deter. A friend killed a large black bear with a .22- hit it just right- that friend also hid out in the barn one night to try to catch e their that was stealing grain. Lo and behold, a black bear went walking 8nto the barn, poked its head around the stall wall, and got a slap in the face by the friend. The bear took off like a rocket it was so startled.
Anyway, a 410 seems a bit weak, but yeah, if it hits the face, even if it doesn’t kill, it will certainly drive off a bear- it’s gotta be wicked painful, plus blinding
Yah, most ammo will kill. especially if you hit a vital spot.
Mind, the little ole 22long has killed more folk than any other.