Originally Posted by BML
I've never loaded under 48 grains and I don't get any pressure signs at all until 50.8 grains and that was with the bullets .010 into the lands.
I've never known a published max load to be an actual max load. They are published low to cover their asses from liability issues.
I've got a few rifles you'll blow your head off with if you try that. My 300 ultra comes to mind; she's doing 3300 fps with a 180 at mid load, and will give bright spots on the brass at top load with many powders. Just because you still get extraction doesn't mean you aren't pushing your luck. I had a strain guage on my last 7stw, and if it seemed warm in that rifle, it was over 65,000 psi already. Some rifles can be pushed a bit if their throat is longer than spec, or the chamber is rather large, but they aren't covering their asses a bit.
It is naive to think they wouldn't want their bullets going faster than their competitors or their powder producing better speed than the rival companies stuff.
If you need more speed, get a bigger gun, end of story.