a while back I got some Nosler 125 accubond and sectioned one of them.... the jacket gets really thick just above the midsection of the bullet and there's a lot of base there too.
Go to Midway and check the reviews on THIS bullet it is showing up as being really tough and getting the job done... just as I had suspected from what I saw.
Same for the newer BT. The Accubond is just a bonded BT, per Nosler.
If you're looking at cutaways of the BT, pay attention to when they were made; the design changed a few years ago, and it does vary by caliber.