Unlike impact craters, pit craters are rimless, often irregularly shaped, steep-sided, and often display no associated ejecta or lava flows.
Such topography consists of shallow, rimless depressions with scalloped edges, commonly referred to as scalloped depressions or simply scallops.
Headspace is not checked, even on rimless cartridges with taper.
This makes them particularly suitable for rimless eyeglasses.
A rimless, smokeless powder design, this cartridge was once considered to be suitable for game larger than deer and black bear.
The rimless design allows for the smoother feeding and extraction of the cartridge.
Cases are rimless and have an extractor groove.
For rimless cases, an extractor groove in the ammunition may serve as the point from which the extractor works.
