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- 9e9631c5f4e7081820f1bcc7dcb0036c6e958979e0c3d1e77f2d60da829eac69 date "September 2015".
- 9e9631c5f4e7081820f1bcc7dcb0036c6e958979e0c3d1e77f2d60da829eac69 isCitedBy Headspace_(firearms).
- 9e9631c5f4e7081820f1bcc7dcb0036c6e958979e0c3d1e77f2d60da829eac69 text "For a rimmed case, where the rim extends beyond the diameter of the case, such as with .22 Long Rifle, .30-30 Winchester and .303 British for example, it is the forward or front face of the rim that is stopped by a ledge at the very rear of the chamber and it is from this forward datum to the face of the bolt that headspace is measured for rimmed ammunition. If the headspace equals the rim thickness, then no open space is available for the head of the case to move into as the case body, or shank, expands and contracts, thereby making it possibly difficult to extract the case after discharge. Competition target shooters will often carefully sort their empty cases by rim thickness into "lots" of similar size, as an aid to creating more accurate ammunition through consistent reloading, making each round as similar as is possible to each other. A rimmed case can have straight, tapered, or bottlenecked case walls.".