If I recall correctly, Swift was the first bullet company to make a bonded plastic-tip.
The first version expanded somewhat wider than the present version, because Swift envision it as a higher-BC bullet for deer-sized game, since they already made the A-Frame for bigger stuff. Nosler had the same idea when they introduced the Ballistic Tip, since they already had the Partition for larger game--but so many hunters liked the accuracy and higher ballistic coefficient of the Scirocco and Ballistic Tip that they started hunting game like elk with the plastic-tipped "deer bullets" and naturally some hunters weren't satisfied with their penetration.
As a result, both companies started making changes. Swift introduced the Scirocco II (the present version), designed to penetrate deeper. Nosler introduced heavy-jacket versions of the Ballistic Tip, and eventually the AccuBond.
