The Accubonds are all supposed to have a white polymer tip.
The ABLR's are all supposed to have a black polymer tip.
Nosler Ballistic Tips are supposed to have different color polymer tips depending on bullet diameter.
If you can section one and easily separate the jacket from the core with pliers, or even without pliers, that would be a definite sign of inadequate bonding.
Were the bullets that displayed these effects noted as factory seconds by any chance? Just curious.
John Barsness posted on another forum only the rear half of conventional Accubonds are bonded, which is how the typical weight retention more closely parallels Partitions, between 60% & 70%, than Swift bullets, around 90+%, for example. I have no clues on the credibility of that info.
My only field experience with Nosler Accubonds was positive. I shot a 100 lbs-ish feral hog in the neck last April at about 100 yards using Federal Premium .25-06 Remington ammo loaded with the .257 110 grain Nosler Accubond at published 3100 fps muzzle velocity. Bang-flop onto that side of its body, but I gave it a finishing shot after the rear leg continued to kick for 15 seconds or so. Examining the carcass the first shot had a small diameter entrance and blew a golf ball size divot of the opposite side of the neck out, but had hit a little too high to directly break the neck. The finishing shot basically did the same in the opposite direction but was centered closer to the vertebrae. Neither bullet was recovered. I plan on using more Accubonds in 6.5mm & 7mm.