Yes of course it will kill deer. Anything that can punch a hole in both lungs will kill a deer including a .22. That said I have never been really impressed by the performance on deer with a 30-30. it makes a hole and with proper shot placement they die. Never had a deer drop on the spot with a 30-30. And most ran further and bled less after being shot through the vitals than any other deer cartridge I have ever used.
