No desire or intentions to pile on here. As I recall, Nosler's primary advertised purpose for bonding the core to the jackets in the Accubond line of bullets is to increase weight retention, compared to the Ballistic Tip line of bullets. The ABs have a reputation for retaining about the same % of weight as the Nosler Partitions, which is in the 30%-50% weight loss parameter that you are desirous of. The ones I've used appear to have performed within that weight retention criteria, although most have passed through and never been recovered. So I don't think you should expect too much different from their bonded line of bullets. Shouldn't expect the explosive, massive shrapnel effect that some of the non-bonded lead core bullets exhibit.
I will qualify my experiences with the ABs by stating that the longest shot I recall with an Accubond was a little over 400 yds, and that bullet passed through and exited a black bear's rib cage. The wound was very lethal, however I didn't recover the bullet. The Accubonds have been 100% reliable performers on game in my experience, meaning I've never had one fail to expand and never had one pencil through game yet without expanding - up to this point in time.
However I did experience a non-expanding pass-through-the-ribcage incident on a Dall ram at a distance of 12 yards about 30 years ago, shooting a 150 grain Ballistic Tip from a .280 RCBS 30 Improved. I believe that few, if any, expanding bullets perform in accordance with design intentions 100% of the time. Since the Accubonds are physically identical to their twin BTs, and since I had a BT fail to expand at high-velocity impact, I am certain it occasionally happens with the AB bullets also. Perhaps even more likely to happen at longer ranges, with the reduced impact velocities.
I re-read my post and didn't do a great job of getting my point across. I hate it when words get in the way!
My main points were supposed to be more clear to state: 1. I think they are on the right track with a tipped but bonded bullet. This theoretically will ensure expansion but eliminate the blowups. 2. For me the perfect bullet is somewhere between the A-max or Berger style explosive grenade type bullets and one that keeps enough weight to still penetrate well with no blowups or penciling. The heavy for caliber A-max's and Bergers do this very well right now IMO but the light to medium weight for caliber bullets don't and a guy has to be careful in certain situations. A tipped bonded bullet, if constructed correctly could theoretically be good for crease shots and shoulder shots because consistent performance could be obtained in soft tissue only hits (the tipped bullets ensures expansion) and shoulder hits where the bonded bullet keeps it from disintegrating.
I will add one point and this is only my experience and observation, with today's flat shooting cartridges, for me, LR is for sure a minimum of 400 yards and probably 5-600 yards and out to 1k. I personally haven't seen 30-50% loss in weight on any AB from those distances especially if no bone is hit.
Bottom line, I am excited to see how these play out in real world scenarios.
Scot E.