When you say the boolit is plasticizing, and gas check pops off, how do we know that the nose is NOT falling apart as well?
Consider this: if 1000fps is Mach1 (speed of sound) then 3000fps is traveling at Mach3.
History tells us that supersonic aircraft in the Mach3 category have titanium leading edges to take the heat buildup. Yes, at mach3 the air friction heats things up to the point that heat treated aluminum loses its heat treat.
So then, how do we know whether or not our boolit nose is falling apart at that kind of speed?
If you think about it, all the high speed jacketed bullets have a minimal lead point showing, if any lead at all. The high speed hollow points are usually a hollow copper nose, no lead.
I propose a test of a bullet like a .35rem, .30-30 or soft nose .30carbine (big lead nose) and drive it on up to 3000fps and see if it also falls apart at that speed.