Announced at the recent 2013 SHOT show, Remington is doing a new mechanically bonded-jacket/core bullet (they call it “mechanilokt”), which seems to be the hip thing lately as Hornady is also touting their “Critical Duty” line with this key feature. The Remington idea is basically taking Golden Saber bullets and strapping a black band (plastic or anodized-copper?) around the cannellure of the bullet which pinches the jacket into the core and prevents core / jacket separation. This line of ammo will be defensive pistol calibers with the name “Black Belt”. The giant sectioned bullet model in photo 3 below would be an awesome collectible!
There is an article with explanations here: