PTG Headspace Go Gage Belted Magnums, 300 Winchester Magnum, 7mm Remington Magnum, 338 Winchester Magnum, 458 Winchester Magnum (.535" Base)
These Go Gages represent the lower limit of SAAMI specifications for proper headspace dimensions. If the action closes with this gage is inserted, then the firearm is within acceptable minimum headspace dimensions.
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