My wife's family built a cabin in Southern Ohio in 1975-8, I had started dating her in 76, so on long weekends, I helped too. Much of the knowledge on how to do this was lost to history, so they used the Foxfire Books as their guide. They built a model from the same materials they would be using and left it in the elements for a few years first, to see how the real life conditions effected it. The chinking was one thing they found lacking and used a different formula. On the round log cabins the spaces are very uneven. They ended up using electric wiring staples to hold 1" grid chicken wire in place as a base for the chinking mixture. It needed more lime than cement or sand, to establish the correct "Grab". Lime is very caustic and was such a pain to work with, but in the long run (40+years) has been the right choice. The really bad news is; in real life you get to chink cabins inside and out!
Some of their experiences were added to later editions of the Foxfire section on cabin building. And their chinking formula is the one now used.
Ivan