It really does sound like bullshit at first glance. Just the most basic projectile motion shows you need a muzzle velocity of something like 5km/s, without factoring in drag, friction, etc. With those, you probably need more like double that. What kind of projectile is going to handle being accelerated to that speed over the length of even a very long gun barrel, in sea-level air? 10kg at 10km/s is 500 megajoules of kinetic energy. What the hell is going to be propelling that thing?
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It really does sound like bullshit at first glance. Just the most basic projectile motion shows you need a muzzle velocity of something like 5km/s, without factoring in drag, friction, etc. With those, you probably need more like double that. What kind of projectile is going to handle being accelerated to that speed over the length of even a very long gun barrel, in sea-level air? 10kg at 10km/s is 500 megajoules of kinetic energy. What the hell is going to be propelling that thing?