I've thought about the toaster oven as well as the dehydrator. I figured the toaster oven might possibly be good for powder coating lead boolits if I ever decide to go down that road. In my early days of reloading I thought about casting but I'm not set up for nor do I have the time at this point. I'm sure I could make time if I really wanted to. I would probably only cast lead projectiles for my .357 if I were to go through with it. Since the shortage my local supply of lead cast semi was cutters has completely dried up. I really liked how they performed in my situation of plinking.
I'm not sure how car battery lead stands up for casting as I have zero experience but I do have several old car batteries that I never returned for the core charge thinking maybe one day they might come in handy for casting if I really wanted to try it.