Bump Gage Inserts are used to measure the amount of shoulder bump when setting up full length sizing dies. These Bump Gauges install in either of t...View full details
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In firearms, headspace is the distance measured from a closed chamber's breech face to the chamber feature that limits the insertion depth of a cartridge placed in it. The exact part of the cartridge that seats against the limiting chamber feature varies among cartridge and gun designs. Bottleneck rifle cartridges headspace on their case shoulders; rimmed cartridges headspace on the forward surfaces of their case rims; belted cartridges headspace on the forward surfaces of their case belts; rimless pistol cartridges headspace on their case mouths.
When headspace is larger than the cartridge case, there is room for front-to-back cartridge movement when the breech of the gun is closed. Excessive head clearance is undesirable for several reasons. It can allow a cartridge's primer to slide beyond the reach of the firing pin to adequately indent the primer to achieve reliable ignition (though extractor hooks may act prevent the cartridge moving forward in this situation).
In chamber designs that don't fully support the case head, it can allow a case to expand excessively, which can contribute to thinning or even split the brass. Thus the cartridge can rupture rearward, which risks releasing hot gases under high pressure that can damage the firearm and cause injury.
If a chamber's headspace is too short, the gun may not close and lock completely, preventing firing.
This accessory to the Concentricity Tool offers the next step in ultra-precision reloading. Its .0005" increment dial indicator helps identify neck...View full details
Hornady Lock-N-Load® G0/No-Go Cartridge Gauges allow the user to check their cases and ammo to ensure a correct fit in SAAMI chambers.
These five Lock-N-Load® Headspace Bushings provide the ability to check most bottleneck cases, from .17 Rem through belted magnums. Ackley Improved...View full details
Sorting ammo by rim thickness will provide ammo with similar ignition qualities for improved accuracy. This proven technique is used by competitiv...View full details
One piece gauge that will check overall length to indicate the need for trimming, datum to head length to assure correct headspace and to prevent o...View full details