Forces are in process changing to none toxic Radwell changed production this year i do believe .
If lead is no danger consider the costs incurred as grounds are actually being made to clean up lead effectively .
Of course the Military can use depleted uranium etc but the trend is none lead for small arms
I have shot steel from shotguns almost exclusively for over a decade or so . There is no big issue with it other than getting the wads sorted and a means of making production economic in the uk .
Upside besides the toxic nature of lead for clay grounds is steel size for size looses energy faster than lead . Those who have used it on game / fowl frequently know all about that 5- 10 yards too far thing when on steel
Grounds made money voluntarily recovering the lead, ask John Bidwell, a firm was contacting clubs offering to recover the lead. None to my knowledge have been forced or are actually being made to clean up the lead, it was done when the price of lead was high and seen by the ground owners as a nice little extra income, recovering the lead from trap or skeet layouts where the lead is confined over an easy area to recover it.
Steel shot will also be an issue not just the wads as the shot is all made in China and requires much more energy to make than lead shot, more processing and hence takes many days to make rather than hours.