It's actually been discussed in story; Miss Militia was asked by a Ward if her power could make a Davy Crockett.
She basically said, "Yes, complete with the M338 Nuclear Ordnance Package". However, she dare not use it, because it takes out entire city blocks. Even a twenty ton yield is equal to 1 MOAB package (got woken up one morning in Pensacola by testing of the damn thing. Reprted into sick call afterwards, got a day to sleep) and capable of wrecking a lot of stuff. However, if Dragon wanted to make some 35kg Confoam rounds using the same system... So a confoam grenade (basically, the M338 was a nuclear rifle grenade for a recoiless rifle) with a low altitude airburst capability...
I think the most amusing use of Miss Militia's power was that she actually manifested a small artillery piece and used it at point blank range, utterly annihilating the member of the Fallen. The gun in question was meant to be man portable by a squad, and was mass produced.... I forget what fic that might have been in... Hmmm.