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17.5 degree shoulder
- It is a rimless cartridge with a bottleneck case that uses 9.3mm (.366") diameter bullets. The cartridge headspaces on the case's small 17.5 degree shoulder. The rim diameter is a standard.470" and brass can be formed from.35 Whelen cases. Maximum case length is 2.441" and the COL is 3.29".
Nov 7, 2017 · Headspace is the distance from the base of the cartridge case to the point on the cartridge case that prevents the cartridge from moving any farther forward in the chamber. To put this into real-world, appreciable terms, I’ll give some examples. Rimmed .45-70 Government cartridges.
- 223 Remington
The .223 Remington is a highly versatile cartridge that can...
- 375 H&H
An eminently flexible cartridge, the .375 H&H Magnum is...
- 223 Remington
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- Types of Headspacing
- Why Headspace Is Important
- Headspacing Best Practices
Two methods are used for placing rimless cartridges consistently for firing. Straight walled or tapered cartridges usually headspace on the mouth of the case, while bottlenecked casings use the middle of the case shoulder as the reference surface. With belted cases, a projecting belt is added forward of the extraction groove specifically for headsp...
Why all this fuss about headspace? Ideally, all cartridges are the same size and always fit the chamber the same, leading to excellent accuracy and promoting consistent cycling. In reality, heat changes headspace. Wear of the bolt and the barrel, and stretching of the receiver change headspace. Powder residue and dirt can cause the chamber to be to...
Since ammunition varies in size and brass cartridges are somewhat malleable anyway, armorer’s headspace gauges are usually made of steel. “Go” gauges look a lot like a dummy round and verify that the space inside the chamber locked by the bolt is sufficient to load the weapon. If the bolt fails to close on the “go” gauge, either the bolt head is to...
It is a rimless cartridge with a bottleneck case that uses 9.3mm (.366") diameter bullets. The cartridge headspaces on the case's small 17.5 degree shoulder. The rim diameter is a standard .470" and brass can be formed from .35 Whelen cases.
May 13, 2018 · This article explains the basics of headspace and shows how to measure headspace (and length to lands) in your barrels with precision. The article also explains how to adjust your full-length sizing dies to “bump the shoulder” as needed.
Dec 8, 2022 · This article explains the basics of headspace and shows how to measure headspace (and length to lands) in your barrels with precision. The article also explains how to adjust your full-length sizing dies to “bump the shoulder” as needed.
Feb 12, 2017 · Different cartridges have their datum lines in different positions in relation to the cartridge. For example, 5.56x45mm NATO ammunition headspaces off the shoulder of the cartridge, whereas .303 British headspaces off the forward rim of the cartridge.
Oct 26, 2021 · What is Headspace? Headspace refers to the mechanical interface whereby a cartridge stops moving forward when chambered. For bottleneck rifle cartridges, headspace is a reference distance between the bolt face and a reference line on the shoulder:
