I would not be driven to ultra light weight rifles at the expense of a steady solid hold.
This is where I'm at. I've fugged up shots at 180"-200" mule deer that without any doubt would of dropped at the shot had I not sold an all up 8lb rifle for a lighter "mountain" rifle.
I shoot ultralight's awesome off the bench. Not worth a chitt offhand. I wish I had my Model 70 Extreme Weather back. Didn't matter what it was, where it was, how winded I was, everything I pulled the trigger on died right then, right there.