Re: .308 win LR deer hunting
You said 35 degrees. What's your elevation? I know Litz uses a really low BC for the 178. He uses an average out to 1k. That said out to 700 it's a bit higher. For the velocities and temps you're running 750 is pretty much as far as I would care to go. I run my 178s quite a bit faster and most critters I'm after are at a fair altitude so I feel comfortable going a bit farther with my set up. When the 190 ALR finally gets released, it may be a game changer for the 308. Decent BC, good weight and LOW velocity for expansion requirements all equal a perfect storm for the lower velocity cartridges such as the 308. If it has a BC close to the 190 VLD, the 308s effective deer range will increase a good amount. I don't have any trouble getting to 2650 with 190s in 26" barrels. At 5000' in 60 degree air, it'll offer 1000 foot pounds at 1k yards.
Long range shooting is a process that ends with a result. Once you start to focus on the result (where the shot goes, how big the group is, what your buck will score, what your match score is, what place you are in...) then you loose the capacity to focus on the process.