Just found out an interesting bit of info ... apparently GDATP (General Dynamics Armament and Technology Products) was selected to provide the cannon armament for the JSF, in the form of the five-barrel 25mm GAU-12/U (the same gun used in pod configuration by the AV-8B).
Muzzle velocites are 3560ft/s for TP and HEI ammo and 3400ft/s for API ammo.
Up to 4200 rounds per minute, or 70 per second.
Average recoil force is 5000lbs (22kN) - for reference purpose the 30mm GAU-8/A on the A-10 has an average recoil of 10000lbs (44.5kN).
80% of the rounds will land within a circle created based upon a 7 milliradian
dispersion pattern. Obviously the diameter of the circle increases proportionately with range. (The GAU-8, a much bigger gun, with bigger rounds, only has a 5 milliradian dispersion pattern!)
The kinetic energy transferred to a target by a single 30mm round from a GAU-8/A impacting is around 90kJ, while a 1 second burst at full rate (70 rounds) will transfer about 422MJ to the target. And thats why it only takes about 6 rounds to destroy almost any main battle tank out there! Then there is, of course, the whole depleted uranium controversy.