A neat article about ancient projectile weapons.
Shall we reality check with GURPS?
.44 Magnum from a 6" barrel gets 3d+2 pi+ for ball. 5-20 points of raw damage that is multiplied by 1.5 for 7 to 30 points (or 18 on average). That's a lot of damage!
According to GURPS: Low Tech, a heavy sling does sw+2 cr damage.
The average schmo (by definition) has a ST of 10 which gives a swing of 1d. So a ST 10 person using a heavy sling delivers 1d+2 cr, for a range of 3-8 points of damage and an average of 5.
ST 11 and ST 12 would only add a point of damage each, and 12 is about the limit of what we'd expect from a common soldier.
So the most we're going to see here is a swing of 1d+2 plus 2 or 1d+4 or 2d crushing. 2-12 points with an average of 7.
7 is the least the magnum can do!
Let's do some math! 50 grams is about 775 grs. 100 mph is just 146.7 fps.
Um, that's just 36.7 ft-lb. of energy. .44 usually delivers more than 1,000 ft-lb.!
So, no; a sling stone does not have the stopping power of a .44 magnum slug.
Also, using Douglas Cole's interior and terminal ballistics calculator, giving a heavy sling sw+2 damage is rather generous. The aforementioned stone calculates out to a mere 1d-2 pi++ (1-8 with an average of 2).
Update:
To get an average 18 damage from a crushing attack you need to do 5d+1 cr. For that you need your sw damage to be 4d-1 that requires a ST of 35 or 36. Someone with a ST36 can also lug around, very slowly, more than a ton (2,592 lb.) on their back.
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