Effects of Gravity & Atmospheric Pressure on Projectile Weapons

[brooklynos]

I am preparing an adventure set on Mars (0.38 G, 0.006 Earth Atmospheres), and I'm wondering what effects the lower gravity and atmospheric pressure would have on slug throwers, assuming a suitable propellant is available. All of the stats given in UT assume Earth gravity and air pressure, it seems.

I know virtually nothing about aerodynamics, so I'm not sure how increasing or decreasing air pressure affects range (and maybe Acc? I'm not sure). I'm assuming there is a formula I could crank figures through to figure this stuff out for various planets.

Gravity seems like it would be a limiting factor more than anything. If the bullet falls to the ground before its energy is spent, then that's its maximum range. Beyond that, I don't think it'd have any real affect. My gut feeling is that the multiplier will be some function of the square root of acceleration due to gravity, though I could be quite far off base.

Any help anyone might lend would be greatly appreciated - particularly in respect to the effects of air pressure on range. Thank you in advance!

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