Germans already took conventional artillery to its limits: https://en.m.wikipedia.org/wiki/Schwerer_Gustav https://en.m.wikipedia.org/wiki/Schwerer_Gustav htt

Germans already took conventional artillery to its limits: https://en.m.wikipedia.org/wiki/Schwerer_Gustav https://en.m.wikipedia.org/wiki/Schwerer_Gustav https://en.m.wikipedia.org/wiki/V-3_cannon https://en.m.wikipedia.org/wiki/V-3_cannon