Actually the Partition was designed to do two things, hold together at relatively high velocity (think 130g bullet at 3000 fps out of a 270 Win) and still expand reliably out to 500 yards on North American big game (think deer, elk, black bear and grizzly). The front section would disintegrate and cause massive damage at close range while the rear section would continue to penetrate, yet it would still reliably expand at under 2000 fps at 500 yards. Very few bullets today will perform at both high velocity and low. A damn good design for it's time. The 150g Partition is still our go to bullet in our 270 Wins
That was my understanding of the bullets performance. Heck, they still load it in Weatherby rounds that are going pretty hot. As some have said they aren't known for extreme accuracy, but still very satisfactory in the ranges most animals are shot. Recently I've seen the Berger claims on their bullets performance. They make a big point of fragmenting a few inches in but retaining some of the rear of the bullet. My first thoughts were they were claiming nothing new, they work exactly like a Partition just more accurate.
Sorry - haven't used the Peregrines yet, although the feedback from others who have is generally positive.
I'm not very scientific, and much prefer actual epxerience over numbers. I've taken well over 100 big game animals with 7mm 140,150,160 partitions running from 2800-3050 fps. I've never experienced a failure of any sort, rarely recover one, and if there's one bullet I would consider to work as designed every single time it would be the Nosler partition. Other bullet manufacturers have been trying to emulate, or play catch up for the past 60 years.