I was a general contractor, and kept a log for thirty years. In the beginning, after a very short while, I realized that all the "log forms" out there left something out. In real life, there was always something that wouldn't fit into the form anywhere, but was important enough I wanted it documented. So I switched to simple pad and paper.
After a log got destroyed in the rain, I switched again, to Rite in the Rain books. That was what I used for more than twenty-five years. The soft sided books can have a pencil folded into them to keep the page, and they fit in the hip pockets of Carhartt's.
Over the years, I used all the styles they sell, but kept coming back to Old Reliable, #374, the Universal Field Book.
Simple lines, write everything you need to write, from a simple one line statement about the weather during the concrete pour to a detailed, multi-page list of facts about an accident. Finished your task? Cool. Write it down. Plumbing sub calls in with a problem? Logged. Whatever it was, I wrote it down.
I put dates at the top, every day started a new page. I wrote the weather as the first line. Then I just started every statement with the time.
For shooting, I kept the habit. A Universal Field Book, each trip to the range or reloading session starts a new page. I keep a separate database for my loads. The log is just a log. What I shoot, where I shot it, whatever I think needs to be written down.
Over time, people (usually young engineers) have told me my log wasn't sufficient in some way, but more than once I've had documentation that no one else had.
So I guess it works for me.