kammarutrymmet

Kammarutrymmet, often translated as "chamber space" or "cellar space" in English, refers to the unused volume within a firearm's action that is not occupied by the cartridge when it is fully chambered. This space exists because the chamber dimensions are designed to accommodate the cartridge casing, which is often longer than the actual bullet.

The presence of kammarutrymme can have several implications for firearm operation and safety. If the kammarutrymme is excessive, it can lead to a condition known as "case stretching" or "case head separation" during firing. This occurs when the rapidly expanding gases push the cartridge casing back against the bolt face, causing the casing to stretch and potentially fail. This is particularly a concern with certain types of ammunition or when handloading.

Conversely, a properly designed kammarutrymme helps to ensure reliable extraction. It provides a small buffer zone for the spent casing, allowing it to be gripped and withdrawn by the firearm's extractor mechanism without undue force. In some firearm designs, such as those with controlled feed mechanisms, the kammarutrymme plays a specific role in guiding the cartridge into the chamber.

The precise dimensions of the kammarutrymme are determined by the cartridge design and the firearm's chamber reamer specifications. Manufacturers aim to balance the need for reliable feeding and extraction with minimizing excessive case stretching. Understanding kammarutrymme is important for gunsmiths, ammunition reloaders, and firearm enthusiasts for proper maintenance and safe operation.