Everybody's learnin' how
C'mon and kill deer with me!
Will it GURPS?
The American Whitetail Hoofrat has 10 HP and no DR with a HT of 12.
.22LR from a rifle does 1d+2 pi-.
.22 Long from a rifle does 1d+1 pi-
.22 WMR from a rifle does 3d-1 pi-; but you'd use hollow points to get 3d-1(0.5) pi.
Aiming for the skull:
.22 LR will do 3-8 points of raw damage, 2 DR for the bone, 1-6 penetrates x4 for the brain hit: 4-24 points of damage. The average roll will see 3 penetrate for 12 points of damage. So a roll of 5 or 6 has a chance to kill it right there.
.22 Long will do 2-7 points of raw damage, 2 DR, 0-5 penetrates and 0-20 points of damage. Average roll sees 2 penetrate for 8 points of damage. You need to roll a 6 for a chance to kill.
.22 WMR will do 2-17 points of raw damage, double DR because hollow points, 0-13 penetrates for 0-52 points of damage. The average roll of 10 will see 6 penetrate and do 24 points of damage. Any roll of 9 or higher has a chance to kill.
Aiming for vitals.
.22 LR, same 3-8 raw damage, no DR, 3-8 penetrates x3 for the vitals hit: 9-24 points of damage. Average roll will be 5 for 15 delivered. Any roll of 7 or higher has a chance to kill.
.22 Long, same 2-7 raw damage, no DR, 2-7 penetrates, 6-21 points of damage. Average roll will be 4 for 12 delivered. Again, you need to roll max damage to get a chance of killing it.
.22 WMR, same 2-17 raw damage, 1-16 penetrates because no DR is 1 DR for hollow points, 3-48 points of damage. Average will have 9 penetrate for 27 damage. Any roll of 8 or higher has a chance to kill.
Aiming for the body:
.22 LR will get 3-8 points to penetrate, but small piercing is halved for 1-4 points of damage.
.22 Long will get 2-7 points to penetrate and get it halved to 1-3 points of damage.
.22 WMR will get 1-16 to penetrate for 1-16 points of damage.
Aiming for the eyes:
.22 LR will get 3-8 to penetrate because no skull DR on an eye hit for 12-32 points of damage.
.22 Long will get 2-7 to penetrate for 8-28 points of damage.
.22 WMR will get 1-16 to penetrate for 4-64 points of damage.
If the deer is wearing a bullet proof vest, no rimfire .22 can hurt it.
It could happen.
Why else do we need AR-15s for?
But a good shot and some luck with the damage shows that you can shoot a deer with a rimfire 22 and make it venison.