The correct answer to that complaint is, "If you don't like the FREE ammo I GAVE you then don't use it."for sure, the first time he misses game or splits a fox in half, it will be the fault of YOUR hand load
If they give you once fired cases you have zero concerns regarding some responsibility for anything. Don't overthink this. Just involve them in the process and have fun. CheersNo, they can buy the components and I'll teach then how to do it with my equipment to start them off.