How would they address ricochets? After all that’s what prompted the change to 22lr on the rifle side. It’s a known fact that they have ricochets on the silhouette side. Eye protection at all times is a must. Looks like much to consider with berms for each distance.
That's a whole different discussion than just cleaning up the lead and making it safer for the staff to work there.
If the metal plates are of sufficient hardness, like AR500 steel, most of the bullet typically liquifies on impact. If the harder core of the bullet remains solid, it can become spalling, or fragments, which can be deflected in every possible direction. That's why KHSC required plates you bring to be suspended so the plate angles downward directing the fragments toward the ground for the most part. The plate's movement also absorbs the energy that could be transferred to a ricochet.
Most ranges I've used on the mainland don't allow steel core ammo which can create a ricochet risk for shooters whether using steel targets or just on the pistol range.
Switching to .22lr if anything can potentially increase the risk of ricochets since the bullet has less energy than larger calibers. Less energy means less force available to destroy the round on impact.
So many variables. The only constant is that there will always be risks when shooting steel.
I've yet to see Hickok45 get hit by a ricochet, and he shoots steel a lot using very few, if any, .22 caliber firearms. And he puts a ton of lead downrange.