The Badger

From a programatic stand point, I think they are looking for results instead of how those results are achieved. As such, I think they use a rather simple bell curve aproach for calculating "Hits" that matches up rather effectively to the much more complex math of "Did it hit, what was its angle of attack, what was its velocity at impact".

Think roll two d6. It takes a 4 or better to hit at 10 meters. Add one to the target number for every 10 meters farther out the target is.

Side note on repeating crossbows in D&D. Their ammo is low but the damage is high compared to what real repeating crossbows could do. The range is far to great also.

In my game I treat them pretty much like hand crossbows that can "Burst". each attack can use either 1, 2, or 3 bolts and does 1d4/1d8/1d12 damage (Medium weapon). Size is the same as a light crossbow. Mag holds 15 bolts.