I suspect many of our ammunition factories are automated where possible.
But, given they have little reason to be competitive (government contracts) they may not be.
Ammunition factories periodically blow up - often for seemingly no reason.
A few percent drop in humidity allows a static electric spark to occur, and the only thing ever found of old Joe on the line is his belt buckle, a mile away.
There has always been an effort to minimize human exposure through mechanization/automation.