YouTube - Electromagnetic Railgun world record setting event
300 nm range. They do not take up large ammunition storage either, just the shells but there is no explosive needed. Soon small modular nuke plants will be widely available, they already exist, to deliver the energy and we can have hundreds or thousands of these installed on anything that floats. There will be a ground version also that will replace long range artillery and short range ballistic missiles. Install these in Korea and it would be game over for the NorKs as soon as they cough wrong. Over 90% of humanity will be within range of these.