Re: .308 win LR deer hunting
If you're getting that much pressure signs with r15 and the 178 at such low charges, you might try more of a slower powder. R17, vv n540 and imr 4320. You could try VARGET though it is similar to r15 but if your lot of 15 is a tad fast, VARGET may be a bit slower. Some of the faster lots of H4350 have done well for me with the heavies. That is only if you even want to chase higher velocities. Nothing wrong with 2635 either.
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.