Konical, that sounds very much like AP - I use them, too, some of them in their 10th reloading and they are recommendable.

http://www.photo-plastic.es/

They are said to be _very_ close to the old ORWO plastic cartridges, the bajonett cap is a simple and sturdy thing.

some people have trouble with the metal type - sometimes the enamel is loose and it will scratch the film. :-)