[OOC][Info]Nothing Better Than This Wiki

[Black Aeronaut]

The fun part about calculating things like muzzle velocities and such is that there are so many variables for any given combination of weapon and ammunition that the only way to be certain is to actually fire the weapon with a high-precision chronograph on the range.

EDIT:

Examples of such variables are (but are not limited to)
Propellant Formula
Propellant temperature
Percentage of lands to grooves in the rifling
Number of rifling turns
Whether or not the barrel was recently cleaned, and with what
If not recently cleaned, then what was being fired last time?
Friction coefficient of barrel material to bullet jacket
Weight of bullet
Amount of propellant
Length of barrel

.... You get the idea.