Well, HE and a number of other types of ammo were being produced a hundred years ago in what we today term as extremely primative factories so I imagine that provided the materials are available, and the knowledge, tools and manpower necessary, it should be feasible to turn out a usable quantity of shells in Organised areas.
The earlier, simplier weapons probably have the advantage over modern weapons with their high tech ammo too in that all a gun really needs (whether it be a .22 right up to monster artillery piece) is a projectile of some type and a charge to push it. As already stated in this thread, there's almost certainly been a return to early 20th century anti-tank weapons like the 6 pdr gun. I don't know that recoiless weapons would be as widespread though due to the increased complexity of the round.
Unguided rockets would be useful weapons too for artillery purposes. Precision goes out the window of course, but if all the gun tubes are worn out, it's better than throwing rocks....
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If it moves, shoot it, if not push it, if it still doesn't move, use explosives.
Nothing happens in isolation - it's called "the butterfly effect"
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