MinnesotaHunter
Well-known member
I don't think the bonded the core because they wanted 2 stage expansion. If you look there is a lip halfway down to limit expansion and gain some weight retention. Not to nearly the extent of a Nosler partition where there are basically 2 cup and core sections, but there is a mechanical limit involved. To a certain extent "bonded" is a marketing term because bonded bullets can be made with plating, soldering or welding so just because a bullet is "bonded" it could mean a variety of manufacturing processes are used. Its like complaining something is put together with screws and not welded, but there are a lot of other design elements to consider too.
If you read Hornady's website, that ring you referred to is called their Interlock ring, which is used on their Interlock and SST bullets. It's purpose is not to control expansion, but to prevent the core from separating from the jacket. The same concept is used in Remington Cor-lokts.
My understanding is that "Bonded" is not actually a marketing term, but I am sure their is some variance between companies.
http://www.rifleshootermag.com/ammo/bonded-vs-non-bonded-bullets/