Thanks for all the responses I received on my question about what to do with a bread bag full of empty eggshells.
That's what I was doing, but I read an article that although those darn eggshells might "disappear" into the soil, they actually don't release any calcium for many, many years. Basically, the author was saying that added cracked eggshells into your compost is adding no value.
Yeah, I've got a bag of powered calcium that I have been using in my calcium feeder.
All my chickens are egg laying hens, but I, too, was thinking that adding additional egg shells to their main feed might be overloading their system.
I bought a food processor from the thrift store for just such a job. However, in the article that I was reading, it said that it did not matter if you crushed or processed your eggshells into powder, the calcium would not be released in the compost in your lifetime.
I saw a YouTube video where they were soaking the eggshells in some kind of vinegar solution. In that process, they stated that the calcium was released from the eggshell in a chemical process. Looked like a lot of complicated work to me.

I'm wondering, if the chickens eat some powered eggshells, would their digestive tract extract the calcium, which would later get passed in their poo, and thereby released into the compost?
Anyways, here is YouTube link on the eggshell situation and that composting eggshells does not really add anything of value to the mix. It was new information to me, but there is a lot of stuff I don't know about.