Ammo in GURPS is not a fixed stat item...
There's actually rules for things you encounter everyday.
Normal everyday 9x19mm ball ammo is:
2d+2 pi Damage.
160/1,800 Range.
8 ST
0.026 WPS.
$0.30 CPS.
Hollow-Points are:
2d+2(0.5) pi+ Damage.
160/1,800 Range.
8 ST
0.026 WPS.
$0.30 CPS.
+P ball is:
2d+2 pi Damage.
176/1,980 Range.
9 ST
0.026 WPS.
$0.45 CPS.
There's actually rules for things you encounter everyday.
Normal everyday 9x19mm ball ammo is:
2d+2 pi Damage.
160/1,800 Range.
8 ST
0.026 WPS.
$0.30 CPS.
Hollow-Points are:
2d+2(0.5) pi+ Damage.
160/1,800 Range.
8 ST
0.026 WPS.
$0.30 CPS.
+P ball is:
2d+2 pi Damage.
176/1,980 Range.
9 ST
0.026 WPS.
$0.45 CPS.
You can combine some upgrades.
+P HP is:
2d+2(0.5) pi+ Damage.
176/1,980 Range.
9 ST
0.026 WPS.
$0.45 CPS.
Anything can be made match ammo too! Multiply cost by 1.25 and you get a +1 to Acc.
So match +P HP would be $0.56 per shot.
Going subsonic changes ball to:
2d+2 pi Damage.
128/1,440 Range.
8 ST
0.026 WPS.
$0.39 CPS.
and adds a -1 to hearing rolls.
Subsonic hollow points:
2d+2(0.5) pi+ Damage.
128/1,440 Range.
8 ST
0.026 WPS.
$0.39 CPS.
Frangible rounds are:
2d+2(0.5) pi+ Damage. No overpenetration if target has DR (p. B408).
144/1,620 Range.
8 ST
0.026 WPS.
$0.45 CPS.
+P HP is:
2d+2(0.5) pi+ Damage.
176/1,980 Range.
9 ST
0.026 WPS.
$0.45 CPS.
Anything can be made match ammo too! Multiply cost by 1.25 and you get a +1 to Acc.
So match +P HP would be $0.56 per shot.
Going subsonic changes ball to:
2d+2 pi Damage.
128/1,440 Range.
8 ST
0.026 WPS.
$0.39 CPS.
and adds a -1 to hearing rolls.
Subsonic hollow points:
2d+2(0.5) pi+ Damage.
128/1,440 Range.
8 ST
0.026 WPS.
$0.39 CPS.
Frangible rounds are:
2d+2(0.5) pi+ Damage. No overpenetration if target has DR (p. B408).
144/1,620 Range.
8 ST
0.026 WPS.
$0.45 CPS.