Ok, first off, there are (2) tools to be used when using moon clips.
A de-mooning tool. Many can easily make one. All you need is a hollow tube of sturdy metal, (steel pipe) that the caliber you will be using fits inside the tube. Cap one end, add a handle, and cut a notch about 1/3rd of the way around the other open end. The longer 2/3rds portion will extend past the clip, while the 1/3rd portion will be under the moon when the empty is put inside the tube. A simple twist will will remove the empties. I've made a few out of old aluminum golf ball retrieval poles. (The kind that has several sections that telescope inside each other.) The ID of the tube determines what caliber(s) they can be used on.
There are many pictures of these types of tools out there.
Then there is the moon loading tools. I have 3 of them I use. A TK Custom, a Unique-Tek, and the third brand escapes me at the moment. I have another one that loads 6 rounds at a time,, but it's slower & not as easy as the others. The ones I use are not caliber specific,, but they DO require different center pilots for the size of the moon center opening. They normally come with a couple of different size center pilots.
These tools can cost a bit more,, than making your own, but are worth every penny. I'll have to see if I can get a picture or two. But again, you can go to TK Customs & look at them.
TK Custom is my favorite & works just fine.