Definitely a lot of shotguns if you do it right. Most of the time, even if you ''do it wrong''. A rare number of people fail using a shotgun by aiming it too close to their faces/upwards though.
A lot of people do die from a shot to the temple because it can cause something like a chain reaction to the brain and organs it controls, but I've seen cases where it simply doesn't happen as quickly, or puts people in a comatose and disability.
It's better to study where the brain stem is with an anatomy chart and mirror to play safe and go for that, not the temple.
Edit.... too long didn't read; I said a lot of words for ''the temple carries risks of not dying instantly, and a slightly lower success rate than aiming where the brainstem is all together''.