PTG Headspace No-Go Gage Belted Magnums, 300 Winchester Magnum, 7mm Remington Magnum, 338 Winchester Magnum, 458 Winchester Magnum (.535 Base)
These No Go Gages represent the upper limit of SAAMI specifications for proper headspace dimensions. If the action closes with this gage inserted, then the firearm may not be within acceptable maximum headspace dimensions and should be examined further by a knowledgeable gunsmith.
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