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Case & Ammunition Gauge .357 SIG

The Shooters Box

  • Case & Ammunition Gauge .357 SIG
  • Item description
  • Weapon compatibility list
  • Manufacturer information
  • The Shooters Box Case Gauge / Ammunition Gauge allows you to check the dimensional accuracy of all critical dimensions of cases / cartridges.
    A loaded cartridge should fit freely and easily into the gauge. A cartridge that does fit properly may not correspond to the proper chamber dimensions.
    Place a clean cartridge into the gauge and make sure that it completely seats by itself with no assistance to seat it.The head of the brass should sit flush within the lower or upper step of the gauge.
    If the cartridge sits higher than the upper step, then your brass might be too long. It's easy to check by eye or with the help of a straight edge or steel rule.
    With the cartridge in the gauge check the backside to make sure the tip (bullet end) is not protruding outside the back face of the gauge.
    If the tip of the bullet protrudes from the end of the gauge it is longer than the maximum allowed cartridge length.
    If the cartridge does not easily drop into the gauge without assistance there is most likely something wrong with the dimensions of your cartridge.
    In some instances, your cartridge may sit flush with the lower step, but the brass may be shorter than the minimum specifications.
    In this instance your ammunition may still fire and function correctly, but it is up to you to confirm this will not cause an unsafe condition.
    It is the re-loaders responsibility to determine the cause of incorrectly sized cartridges and to correct it.
    In some cases, ammunition previously fired with maximum powder loads or with abnormally large barrel chamber diameters may not fit this gauge.
    This is due to some resizing dies not being able to fully resize the brass cartridge all the way down to its head.


    • Allows checking the maximum cartridge length (full overall length), the minimum and maximum case length and the maximum case diameter.
    • CNC milled


    • Material: Steel
    • Caliber: .357 SIG

    WARNING !!! Never try to manipulate loaded cartridges. This is extremely dangerous and could cause injuries.

  • Please note! The offered accessory product fits according to our knowledge on the following weapon models.

    Please also note the exceptions in the item description under “Not suitable for”.

    This information is without guarantee. For further questions you can contact our expert team from Mo.-Fr. 9:00 – 17:00 under the following phone number +49 (0)2206 9519 440.

  • The Shooters Box

    The Shooters Box

    The Shooters Box is an innovative American company based in Malden Massachusetts, which is specialized in the production of special accessories and measuring tools for firearms.

    The production takes place purely in the USA.

    Among its best-known products include, among others:

    • Solvent trap oil filter adapters for firearms to catch cleaning solvent during the normal maintenance process of the weapon
    • Case and ammunition gauges, that allow checking the dimensional accuracy of shells and cartridges for ammunition reloaders
    • Optic mounts for handguns.