>>16707892 (OP)Hot plasma. That gundam thing's fucking retarded. Ain't no way to contain a nuclear blast with something that small. Even if you could, neutrons are going straight through the barrel and causing instant death to the pilot. There are nuclear shaped charges, there's the casaba howitzer proposal. A better option is the Shaped Nuclear Accelerated Kinetic(SNAK) charge idea. Use a casaba howitzer to accelerate a decent sized sail, up to 50% of the charge's energy might be converted to projectile velocity. That means that 0.02-0.03 C projectiles are probably viable