Our innovative patent pending 3 step face design will measure the minimum case length (lower step), maximum case length (middle step), and also show you the SAAMI specs for the maximum allowed chamber headspace (the difference between middle and upper step which is the face of the gauge). See pictures for more information.
The Shooters Box case and ammunition gauges are manufactured right here in Malden Massachusetts, by American workers on American machines! Made from Stainless Steel and built to last a lifetime. Each gauge is manufactured to S.A.A.M.I. (Sporting Arms and Ammunition Manufacturers Institute) chamber/headspace specifications. The gauge will measure the maximum cartridge length (full overall length), the minimum and maximum case length, the maximum case diameter, and the minimum and maximum headspace. 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 within the lower and middle step of the gauge. If the cartridge sits higher than the middle step then your brass might be too long. If the head of the brass sits below the lowest step then your brass may be too short or the bullet crimp is too much. It's easy to check by eye or fingertip feel 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 the entire cartridge 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. Any ammunition shown in the pictures is for representation purposes and is not included with this purchase.
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