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- The rimless bottleneck cartridges, like the.223 Remington,.308 Winchester,.30-06 Springfield and.270 Winchester, have an extractor groove cut into the base of the case, just north of the case head. As a result, these cartridges use the shoulder of the bottleneck for headspacing.
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Nov 7, 2017 · Rimmed cartridges use the thickness of the cartridge rim for headspacing. Rimless bottleneck cartridges headspace off the shoulder. Rimless straight-walled cartridges (most pistol rounds) headsapce off the case mouth. Some belted cases headspace off the belt, while others headspace off the shoulder.
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What rimless cartridges have headspace on the case mouth?
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Where do bottleneck rifle cartridges headspace?
Do rimless pistol cases have headspace?
Apr 20, 2009 · They headspace on the belt in front of the extractor groove; it's typically .220 inch in front of the case head. A close cousin is rimmed cases, such as the .30-30 Win. that headspaces on the front edge of the rim just like .22 rimfire ammo.
Dec 6, 2023 · The .38 Special and .357 Magnum, despite having a rim, headspace on the case mouth. Interestingly, the .38 relies on its rim when used in the longer .357 chamber. Most modern rifle cartridges, such as .223 Remington or .30-06, achieve proper headspace because of the cartridge’s bottleneck.
In general, bottleneck rifle cartridges headspace on their case shoulders; rimmed cartridges headspace on the forward surfaces of their case rims; and rimless pistol cartridges headspace on their case mouths.
Since a straight-walled rimless cartridge is designed to headspace off of the case mouth, this prevents the ammunition loader or manufacturer from using a heavy crimp, which is a ring pinched or "crimped" into the cartridge case, designed to lock the bullet securely in place until fired.
Mar 26, 2021 · straight-walled rimless case headspaces on the case mouth, so the case length is the critical feature. Popular pistol rounds like the 9mm Luger, .40 S&W, and .45 ACP fall into this category. The .450 Bushmaster and .350 Legend are examples of rifle cartridges that headspace on the case mouth.
Headspaces off the Case Mouth. The vast majority of rimless straight wall cases headspace off the case mouth. Even cases with bottlenecks such as the 357 Sig headspace from the case mouth. Why is this? Well, the many pistol cases (except for the 357 Sig) are straight walled, and do not have a rim.
