Ordo said:
Shoot, I'm always interested in musing on munitions.
At first, the guns didn't make sense. Canonically, the ammunition comes from an "ammo slug" in the gun that the gun takes chunks out of and turns into ammunition. This didn't make much sense to me, because you could fire hundreds of rounds without any reloading. Exactly how
big was this ammo slug? Basic geometry provided the problem. How many bullets could you
really carve out of a block before you ran out of block? It seemed completely illogical. Even being incredibly generous and assuming half the gun was actually housing the block,
and assuming the machine that took the slugs out of it was compact enough to take up effectively zero space, you still shouldn't be able to get out more than fifty shots with an assault rifle before having to reload.
But, eventually, the answer came to me. On the Citadel in Mass Effect 2, from the ubiquitous Gunnery Chief.
"This, recruits, is a 20 kilo ferrous slug. Feel the weight. Every five seconds, the main gun of an Everest-class dreadnought accelerates one to 1.3 percent the speed of light. It impacts with the force of a 38-kiloton bomb. That is three times the yield of the city buster dropped on Hiroshima back on Earth. That means that Sir Issac Newton is the deadliest son-of-a-bitch in space. Now! Serviceman Burnside! What is Newton's First Law?"
"Sir! An object in motion stays in motion, sir!"
"No credit for partial answers, maggot!"
"Sir! Unless acted on by an outside force, sir!"
"Damn straight! I dare to assume you ignorant jackasses know that space is empty? Once you fire this hunk of metal, it keeps going till it hits something. That can be a ship, or the planet behind that ship. It might go off into deep space and hit somebody else in ten thousand years. If you pull the trigger on this, you are ruining someone's day, somewhere and sometime. That is why you check your damn targets! That is why you wait for the computer to give you a damn firing solution! That is why, Serviceman Chung, we do not "eyeball it!" This is a weapon of mass destruction. You are not a cowboy shooting from the hip!"
"Sir! Yes sir!"
Note the important bits here, bolded for your convenience. The projectile is solid, not an explosive. The slug is ferrous, which means it's made of iron or some iron-derivative. The slug is also 44 pounds, and small enough for Corporal Shutyourfaceprivate to pass it around to the recruits and tell them to feel the heft of the thing.
There's something 'wrong' there. A projectile that size would not make an explosion triple that of the Hiroshima nuke through simple kinetic impact, even if you fired it at 1.3% lightspeed. The projectile would need to be the size of a bus or larger before that would work.
Force = Mass x Acceleration
Then I remembered something very important. ME tech works both ways. It doesn't just remove artificial mass. It can
add artificial mass as well. What that gun is presumably doing is using a dedicated ME field to 'bulk up' the slug's mass immediately before or the instant after it is fired, allowing it to hit with much greater force than it has any right to. ME tech allows the free manipulation of
both variables in the force equation. By freely adding and removing mass, you can increase the mass of the slug
and increase the power of the acceleration to a degree that is limited only by how much electricity you have to power the devices being used.
Once I came to this realization, of how ME technology can be applied to ballistics, I suddenly had my answer for how the guns work. They aren't firing bullet-sized pieces of the slug block. They're firing
tiny flakes and granules of the slug block that have had mass artificially added to them by an ME generator in the gun, bulking up their effective mass until they have the same stopping power as a bullet-sized piece of material, or possibly
more.