I also went on my first sheep hunt this past summer (northern BC) and definitely can echo most of what others have posted above.
Try to get a bunch of weekend “test” trips with all the gear you want to bring before hand. Really helps decide if you really need something or if it is just a want item prior to being way back in the mountains with no place to ditch excess kit.
If you are going with other folks I would say try to split the kit up as much as possible - again the spotters etc. I went solo so had no choice but to pack it all.
For the rifle; again you are with other people so not a big deal as far as worrying about bears, solo it is a bit more of a concern. I just brought my 30-06 for sheep with Hornady 178gr ELD’s and then had a mag in the rifle of 220gr Interlocks as my hiking ammo. Not the best round for bear but better than nothing and made the rifle dual-purpose in my case.
Good cardio paired with broken in boots will go a lot further than any lightweight piece of gear. That and a good sleep (quality pad and sleeping bag) will help you enjoy your trip more than worrying about what brand or weight it is!
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