The bullet slump issue was only on Gen 1's and only when pushed very hard. I never seen it under 2900 fps. That condition was usually
related to fast accelerating ball powders and twist rates faster than 1 in 10. Those days are long past. I have been pushing the OTM tactical target hybrid to 3200 and a little beyond for some time now. These are real velocities over an Oehler 35 and also a Magneto Speed at 4100' ASL. I have shot the OTM's at all distances out to 2971 yards where they held 1 moa while sub-sonic. I have repeatedly shot 2 and 3 shot groups into 1/2 moa at just over a mile into steel and paper targets. Took 5 bulls with that combo last year. Although one under 300 yards may not have exited we had a wound channel large enough to feed a 1" wide steel tape through and went 26" diagonally through the far shoulder. Tracking a bull with these kind of wounds are not an issue as we never lost sight of them. None left the area they were standing. Ironically enough one did make it barely outside 100 yards after shot. He bailed off the back of a steep ridge as the herd bolted after the impact. I was spotting for my wife and watched the hide ripple in the sweet spot of the crease. The sound of the impact coming back to me was easily heard even with ear plugs. The shot was 765 yards. Muzzle velocity average is 3198 fps. Here are pics of what we found including entrance and exit hole. I think he was dead while running a short distance. Have a look for yourself and see if this would suit your needs.
The bull ran head on down this steep hill hitting the tree to the right and bouncing off. We glued his skull back together after boiling it.
Entrance location and entrance was .338 dia.
Exit location when I rolled him over
Close up of exit showing 1 1/2" exit on far side with chunks of lungs sucked out .