It always fascinates me when people can do something with their own hands. It's like a kind of meditation. Unfortunately, I myself do not know how to do anything of the kind, although I have always been very eager to learn, but I never get anything interesting.
Working with one's hands is exactly that, especially when it's being done for enjoyment. We all go to work and use our hands, but when we do DIY, create art and craft, play music, make ammunition it's something different. I learned how to make ammunition a long time ago and have been doing it for years; I've never found it a chore, it's always been enjoyable and somewhat meditative as you say.