12GA 3" Case Gauge
The Shooters Box case and ammunition gauges are manufactured
right here in Malden Massachusetts, by American workers on American machines!
Made from 1" diameter T6 6061 Aircraft Grade Aluminum and built to last a lifetime. Each gauge is
manufactured to S.A.A.M.I (Sporting Arms and Ammunition Manufacturers Institute)
chamber / headspace / length specifications. The gauge will measure the maximum
cartridge length (full overall length of un-crimped hull), the maximum overall case length
for both folded and rolled cartridge hulls, the
maximum case diameter and the headspace.
A loaded shell should fit freely and easily into the
gauge. A shell that does fit properly may not correspond to the proper
chamber dimensions.
Place a clean shell into the gauge and make sure that it is completely
seats by itself with no assistance to seat it. The head of the brass should
sit either slightly lower than the rim of the gauge or flush with it (acceptable
headspace measurements). If the brass
sits higher than the rim of the gauge then there is something out of spec with
your shell. It's easy to check by eye or with the help of a straight edge
or steel rule. With an empty unloaded shell in the gauge check the backside to make sure the
un-crimped and opened hull is not protruding outside the back face of the gauge.
With a loaded shell in the gauge check the cut-out slots to make sure the folded
hull is not protruding into the first cut-out step and that a rolled hull is not
protruding into the second cut-out step. If the hull protrudes from the end of the gauge
or into the slots then it is longer than the maximum
allowed cartridge length for unloaded or loaded ammunition. It is If the
shell does not easily drop into
the gauge without assistance there is most likely something wrong with the
dimensions of your shell.
Complete satisfaction guaranteed. If for any reason you
are not satisfied with this product please contact us at 781-321-9899.
WARNING!!! NEVER ATTEMPT TO
RESIZE LOADED CARTRIDGES. THIS IS EXTREMELY DANGEROUS AND COULD LEAD TO AN
ACCIDENTAL DISCHARGE CAUSING INJURY OR DEATH.
It is the reloaders 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. Any
ammunition shown in pictures is purely for representation purposes and is not
included with the purchase of this gauge. This purchase is for ONE case
gauge and not multiple items as may be shown in some pictures. Finished in
a brush satin aluminum finish. CNC manufactured to SAAMI specifications
+/- .002"
Technical Information
Notes:
If your cartridge will fit into the gage, it should fit in any firearm chambered
to SAAMI specifications for this specific cartridge.
Not all firearm chambers or magazines are designed to SAAMI specifications.
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