Also - lifetime of the shot (in ammo section) will affect how far it goes.
ie if lifetime is 1, and muzzle vel is 750 - then range =750
If lifetime is 1000 but vel is 1 - range = 1000
If lifetime is 0.5 and vel is 2000 - then range = 1000
Hope that helps you out. In future there are ALOT of weapons tutorials in the tutorials section - like Finalday says, please have a look and check them before posting these topics. If for no other reason than :
1) You don't have to wait a few days to find out answer, you can find it within ten minutes of looking
2) We don't then have to spend time typing out the answers, when you could have found it the day before