The 308 has been used to effectively harvest deer at 700+yds by hunters I trust on a deer cull in Sask.
The muzzle velocity is never high enough to grenade modern poly tipped bullets even on a major bone impact (ie shoulder). Broadside is a no brainer.
You will get a large exit wound. Most of mine are in the 2" to 3" range. That can bruise alot of meat so aim for parts you don't plan on eating.
As long as impact velocity is above 1500fps, the SST and new BT will work their magic.
As for impact test, I remember the issues Win had when they were coming up with the Failsafe. They did short range reduced velocity testing as this was very easy to set up.
Apparently, when those bullets were used in the field, they didn't work. The issue had to do with rotational velocity and impact velocity at distance which was different enough from a SR reduced velocity load to give incorrect data.
I just throw that out for trivial info. Have no way to confirm.
Personally, I have shot through steel plate at 385yds so can't see a deer offering more resistance.
Jerry