Depends on several factors actually:You don't need 10 rounds to kill a deer.
1) The size of the deer (a 10,000 lb deer may require more rounds to put it down)?
2) The size of the round? .17 HMR is not a good deer round...
3) Is the deer hopped up on meth or pcp, or is it rabid?
4) Is the deer wearing armor?
5) Is it a cyber deer or other DARPA or Military project?
So, it may require more than 10 rds, or if one is just a bad shot...