you can push an 87 or 85 grain in a 243 to 3150 fps MV or a little more if you want it to be as hot as possible.
I only have experience with the 85 Sierra and the 87 Hornady BTHP, but I'd tend to run them at the 2800 fps MV...
Slowed down some I think I've gotten deeper penetration than at the higher MV. Both being HPs, they will give a hollower wound, at the faster velocity, wider but less penetration. no one ever seems to consider the resistance of the deer's meat.
Think about slamming your fist into water, while in the lake. Hit it real hard you feel the resistance of the water..
Hit it with your fist slower, and you feel little to no resistance....Same concept in soft material such as meat.
I've also used both the 85 Sierra BTHP and the 87 Hornady BTHP in a 6mm. I'd have to pull my notes but it was in a 18" Model 7 so speeds were down. I can say based on my results that the Sierra is most definitely a tougher bullet, but both work.
The Sierra 85 gr is the best of both worlds IMO. At least at milder speeds which is all I have to go off of. Opens up easily but plows on through. I wouldn't expect an exit on a hard quartering shot, but cross body shots were not an issue.
