I do keep track of temp now and adjust loads quite a bit here in Michigan with the temp swings. My Dasher load is 33.2 in winter and drops to 32.8 in the heat. I used to clean every range trip no matter what and that hasn't been needed.
I bought a SKB iseries case that is the size of the Pelican 1750. It is well made, durable, but on the heavy side. I bought one a lighting company used to ship bulbs and ballasts off eBay for $120.
Sordins for me. I have no problems with cheek weld. The Peltors got in the way at the bottom for me in limited shooting. My friend has them and loves them though.
Looking at mine with the Impact you'll need at least a 1.5" to use the sunshade. I have 1.1" rings and there is no way I could use my sunshade. I'd need another .4-.5.