The ceptics used to actually have a nuclear warhead firing recoiless rifle (Mk54 Davy Crockett) in service. Got retired when they realised that because of the range of the weapon the crew firing it could still be within the blast radius of the warhead. The manual actually suggested siting the weapon on the reverse slope of a hill so as to mask oneself from the impact effect - I sh!t you not!
And we thought that the SA80 was dangerous to its user!!!