Topic summary
Rimless
Extracted from the Wikipedia article Rim (firearms).
Rimless
As early as 1867 Joseph Whitworth patented a round which "has a solid metal back without any projecting flange, as heretofore, the ring groove already mentioned being a substitute for it". Even though some rifles were designed for rimless cartridges by Bethel Burton, Eduard Rubin and others, the first adoption did not come until 1888 with the German Patrone 88.