Hi Bill. You are correct, as usual.
I thought the original question only pertained to the "Camillus Classic Cartridge" Series, which is limited to the seven knives I listed. There are other "cartridge" themed knives though.
For instance, I also have the Camillus "Safari Series" which is only two knives, both large Bullet Trapper patterns, which have wood handles, and cartridge shields. CSS-1 has a 375 H&H Magnum cartridge shield, and CSS-2 has a 300 Winchester Magnum cartridge shield. I've seen other Camillus "Cartridge" knives with delrin handles (like the one at the link you posted) but I wasn't interested and so don't have any.
The "Camillus Classic Cartridge" series, in addition to the cartridge shields, also has a blade etch of the original blueprint drawings of each cartridge, complete with specs. Really cool. The "Camillus Safari Series" has a blade etch of a leapord on CSS-1 and a Cape buffalo on CSS-2. Also pretty cool.
I think the "Camillus Classic Cartridge" Series is the one to collect though, if you're going to be choosy.