The limiting factor in pressure isn't the actions (normally) or the barrels. It's the cases. No reason to run pressures that high. Temp sensitive powders don't do a thing when you get dew in your barrel on a foggy morning, or dust on the prairie, or a long case pressing in on the bullet etc etc. When you push the envelope, you're asking for it. If you do it with one of the enclosed face actions, (Rem Weatherby etc.) you'll lock up the action and the hunt is over.
All for what?? another couple hundred FPS? bragging rights at the club about how fast your old Ought-six shoots??
