Can anyone who has a Remington Model 788 22-250 Please give me the measurement in thousands from the rear to the front edge of the locking lugs. My nephew has the rifle and someone has polished the Bolt to a bright finish. He is curious if they removed metal thereby increasing the head space. I do not have or not for sure what head space gauge would be used. If I remember correctly? The 22-250 cartridge originated from the 250 Savage Round. And I have other head space gauges but no 250 it it would be the one? Any measurements, measurements with digital pictures, schematics would be appreciated. He just was given the weapon form his uncle. Thanks in advance for any insight.