I am not sure what kind of hunting you are used to, but for elk hunting you will probably be doing a lot of walking in steep, high elevation country. That makes the long johns and boots you take much more important than hiking around in flat low country. If you don't own a premium pair of long johns, ones that WICK MOISTURE, you need to buy a pair. And if your boots don't support your foot and ankle well, you need to invest in a better pair. I talk from bad experiences trying to "get by" with cheap boots and long johns and paid with being cold and blisters.

With long johns, think wicking ability, not warmth. When you hike in the mountains, you sweat no matter how cold it is, and if your long johns hold moisture instead of wicking it (which is what cotton does) you will be cold.

One way to cut weight is with a good quality down sleeping bag. Whatever you take, buy quality because being cold all night is miserable.

I realize that this doesn't answer the question you ask, but hopefully it will be useful info.