MAC Gun (Magnetic Assisted Cannon)

Weapon Name- MAC Gun (Magnetic Assisted Cannon)
Round Type- 120mm (4.7) Rheinmetall Ammunition
Over-all length- 6.6 meters (7.2 yd), 21.6 feet
Barrel length- 55 calibers (120mm x 55, or 6.6 meters)
Weight- 7,310 lb (3322 Kg)
Rate of Fire- 12 RPM
Feed Mechanism- 1-round internal magazine (Although autoloaders can load each round like it's semiautomatic)
Round Capacity- 1
Effective Range- 8000 meters (5 miles), 16,000 meters with Magnetic Assistance
Range- Unverified
Accuracy- 2.05 MOA
Accessories- N/A
Quick switch firing mechanism- N/A
Scope/Sights- Internal Monitor
Muzzle Velocity- 1810 m/s with Uranium Penetrator, 2310 m/s with Uranium Penetrator and Magnetic Assistance
Firing System- M256 120mm Gun
Miscellaneous/electronic information- Basically identical to the Rheinmetall 120 mm gun except for the Magnetic Assistance
Basic Information
The weapon is basically identical to the Rheinmetall 120 mm gun except for the Magnetic Assistance it provides on specialized Depleted Uranium/iron rounds. The rounds are basically identical to the 8.35 kilogram M829 in shape, size, and application except for the fact that the one used in the MAC gun is roughly 7.82 kilograms due to it's composition of roughly 10% iron, and 90% uranium (with other trace elements, such as Zinc which form a staballoy). The iron acts as a super ferro-magnetic material, and increases the felt effect of the magnetic field in the paramagnetic permeability of the depleted uranium, allowing it to achieve a higher level of efficiency per round.
The magnetic system operates very simply, being a very base type of rail gun. A large innovative factor of the weapon is that it uses magnetic disks rather than magnets on the side, which increase it's ability to transfer a magnetic charge to the round over something with a purely lateral magnetic propulsion system. Another innovative factor is in the concept that it uses a base propulsion system to quadruple it's energy levels rather than attempting to do so on it's own, which increases it's efficiency levels and allows the weapon to use conventional ammunition with little problem. The weapon is essentially a hybrid railgun gunpowder propellant projectile propulsion system, that utilizes two forms of energy to increase it's capability and efficiency. Why the weapon is capable of achieving otherwise fundamentally impossible capabilities, especially in relevance to it's size, is primary associated with it's hybrid operation, and the exploitation of basic physics. Energy, in joules (metric) is 1/2 (mass)(velocity) squared, which in this application quickly translates to two things- by doubling the velocity you quadruple the energy, and by doubling the mass you only decrease the velocity by roughly 29.4% (1000 m/s down to 708 m/s and 708 m/s down to 500 m/s, by doubling the mass, which in turn translates to eight times the inertia for only halfing the velocity). Velocity is much harder to increase in straight linear applications, and is why using Railguns or high grade Propellants lends itself problems in achieving high energy levels (as does everything else). However, Rail guns in particular exponentially increase their capabilities. In rail gun and most magnetic gun (or projectile launcher) applications, typically, the higher the velocity of an object is the faster it speeds up.
Sometimes this is a flat acceleration rate- for example, a 1 gram projectile requires .1 joules to speed up from 0 m/s to 10 m/s, were as to speed up from 10 m/s to 20 m/s it requires .3 Joules. This is because it requires four times as much energy to double the velocity of mass, which means that a constant, steady acceleration would result in an exponential increase in energy.
This also means that a direct initial velocity translates into an exponential increase. The equation for said velocity increase is V=u+L'/2m * (integral 0→t) I2dt, with U being the initial velocity. Disregarding the other bit of the equation, this basically translates that initial velocity is a simple additive number to terminal velocity at the end of the rail gun. As stated before, a flat velocity increase or acceleration is of course, exponential in itself. What it means is that, the initial velocity of a projectile translates into a direct additive to the projectile velocity itself.
Basically, without an injection velocity, a normal rail gun or conventional artillery piece that could say, accelerate a 7.82 kilogram projectile to 500 m/s would require close to 1 million joules of energy. To accelerate a projectile to 1810 m/s would require roughly 12.52 million joules. To accelerate a projectile to 2310 m/s would require roughly 20.8 million joules, or a 500 m/s or a 27.5% velocity increase requires 166% more energy. With using the hybrid system, a railgun with an injection velocity of 1810 m/s need only 1 million joules of equivalent electricity to accelerate a projectile by 500 m/s, or to 2310 m/s, which in a linear system would require 8.28 joules of equivalent electricity.
While the energy requirement to accelerate the projectile is technically the same, as energy cannot be created or destroyed, the energy requirement on the devices in work is lowered. Instead, like in all magnetic accelerated projectiles, a large portion of the energy is gathered from the projectile, in the form of magnetic fields. While this may seem like the projectile depletes the projectile of energy or is seemingly endless, like in all electromagnetic forces, such as gravity, two opposing forces cancel each other out resulting in a net force required of 0. For instance, the gravity of the earth may seem endless in the idea that it can hold people and small objects down indefinitely without an energy requirement (objects without any assistance). However, what is forgotten is that a human applies the same amount of gravitational force to the earth that it receives from the earth; however the mass comparably of a human is usually drastically smaller, making the gravitational effect of a human to earth less noticeable when compared to the effect of the earth on the same human. The earth's gravitational force is high enough to apparently "Hold down a person" were as the gravitational force of the human appears to have little effect on the earth; even though it does have some effect.
With this in regard, it is easy to understand how a projectile using it's magnetic forces in a different matter would develop more energy with a lower single linear power source. The energy is always present, and the net forces cancel themselves out, however they are used in a different manner, chiefly in this case to propel a projectile at higher velocities.
What this translates to in a MAC gun is that 1 million watts (1 joule per second) of electricity and 12.52 million joules of propellant translates to roughly 20.8 million joules being transferred to the projectile, lowering the amount of energy required by the propulsion system to fire the projectile. Ideally, the amount of energy from each type of power source would be equal to achieve the highest potential in energy gains, which would be roughly 400%. However, due to extenuating circumstances, this being that explosive propellant acceleration is much easier to produce than electrical acceleration, the figure of the highest efficiency in terms of size and realistic application (not direct energy) is dependent mostly on the energy source of both the propellant and electricity, which is forever changing and would require a series of extremely complicated calculations on the specific capabilities of the propellant and the rail gun used in that particular application- which of course, would require intensive study, and probably would never be exact even so.