I think you have the temp changes in order. Also be prepared for sun, rain and snow; you will likely get all three. I would assume your outfitter has a weight restriction. It's not so much for the flight from YUL to shefferville, but for the beaver or otter they will use to get you to your camp. So, pack prepared but pack light.

You will likely be put in an area where there has been recent success. Make sure you have a good pare of binoculars as you will be doing a lot of glassing. You will likely be before the main migration; so you'll be seeing mainly bachelor groups of bulls. It's different every year, so who knows; but this is the trend I've seen.

You should be prepared for shots up to 300 yards; but most likely you'll be shooting at about 100-150 yards or less. Don't forget, people bow hunt as well.

I'm not sure how it works for Nordik. The outfitter I've used (Jack Hume) flies a floating cessna around. Every couple of days they will pick up the meat as long as they have meat. If you shoot your caribou early enough in the trip, there's a good chance they will be able to have hit butchered, vaccuum packed and frozen by the time you get back into Schefferville. At the camps they used meat rooms. They were uncooled, but had screens on them.

Good luck. You'll have a great time.