Crossbows in GURPS (Low-Tech)

For a recent TL4 game, I wanted an array of crossbows available for purchase, broken down by ST and performance, with commensurate weight, cost, etc.  Thrust damage has breakpoints at odd-numbered ST values, so I skipped the even numbers.

Crossbows

Crossbows
Weapon	Damage	Acc	Range	Weight	Min ST	Eff ST	Draw ST	Bulk	Cost	Notes
Crossbow ST 9	1d+2 imp	3	180/225	5 lbs	7	9	9	-5	$125
Crossbow ST 11	2d-1 imp	3	220/275	6 lbs	7	11	11	-6	$150
Crossbow ST 13	2d imp	3	260/325	8 lbs	8	13	13	-7	$175
Crossbow ST 15	2d+1 imp	3	300/375	11 lbs	9	15	15	-8	$200
Composite Crossbow ST 15	2d+2 imp	4	375/450	9 lbs	8	15	15	-6	$1000	Includes Goat's Foot
Steel Crossbow ST 15	2d+2 imp	4	375/450	15 lbs	11	15	30	-7	$750
Steel Crossbow ST 17	3d-1 imp	4	425/510	19 lbs	12	17	34	-8	$850
Steel Crossbow ST 19	3d imp	4	475/570	25 lbs	13	19	38	-9	$950
Steel Crossbow ST 21	3d+1 imp	4	525/630	33 lbs	14	21	42	-10	$1050

Min ST - Lifting ST required to simply wield the crossbow's mass in combat, independent of its draw strength.

Eff ST - Strength of the crossbow for range and damage purposes.

Draw ST - Lifting ST required to draw the crossbow. Use one of the drawing mechanisms from Low-Tech p.79 to increase your effective Lifting ST.

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Crossbow - A simple crossbow, with a wooden prod of ash, hazel, or yew.

Composite Crossbow - Has a nomad-style prod of laminated horn and sinew construction. This example includes a Goat's Foot drawing aid (Low-Tech p.79), allowing a man with Lifting ST 11+ to draw the crossbow while in the saddle.

Steel Crossbow - A steel prod can be much stronger, permitting higher tension and striking power, but cannot be drawn as far. This requires additional mechanical advantage to cock the crossbow.