While handling this box I was pondering at different types of ammo: rimmed, semi-rimmed, rebated and rimless. Intuitively I think that rimmed appeared first, and rimless second, and the other two are probably in-between attempts for improvement. Am I right? But why to manufacture rebated ammo now, when rimless is available? Any technical advantages?


Modern rebated rim cartridges allow the use of high capacity cases in firearms with small bolt faces without having to alter the bolt. For example, the Beowulf in an AR-15.


Rebated would normally be used where a existing bolt face is to small to accommodate a full (case) diameter rim.

You forgot the belted cases, unless you want to include them as a sub-set of the rimmed design.