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Rifles, Reloading, Optics, Equipment
Reloading
Headspace 10-round sample
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<blockquote data-quote="bigedp51" data-source="post: 1421663" data-attributes="member: 28965"><p>The Colt Field gauge pictured is maximum military headspace and not a GO gauge. I just grabbed the closest .223/5.56 headspace gauge to adjust the Hornady gauge and it happened to be the Field gauge.</p><p></p><p>If you look at a SAAMI cartridge and chamber drawing the headspace is listed as Min and Max with .010 between the two gauges. The GO and NO-GO gauges are used for checking and adjust headspace on "new" rifles. And the field gauge is for checking older worn rifles for maximum allowable headspace.</p><p></p><p>I adjusted the Hornady cartridge case headspace gauge by placing a .011 feeler gauge between the red and silver sections of the gauge. Meaning the unadjusted Hornady gauge was reading .011 shorter than the Field gauge. Yes the Hornady gauge is just a comparator gauge "BUT" if adjusted it will give very close measurements to the actual chamber length.</p><p></p><p>Your head clearance is the "air space" between the rear of the case and the bolt face. And how far the case must stretch to meet the bolt face when fired. And your shoulder bump is the same approximate distance as you head clearance, "IF" the sizing die is adjusted correctly.</p><p></p><p><img src="https://i.imgur.com/HK76WCp.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="bigedp51, post: 1421663, member: 28965"] The Colt Field gauge pictured is maximum military headspace and not a GO gauge. I just grabbed the closest .223/5.56 headspace gauge to adjust the Hornady gauge and it happened to be the Field gauge. If you look at a SAAMI cartridge and chamber drawing the headspace is listed as Min and Max with .010 between the two gauges. The GO and NO-GO gauges are used for checking and adjust headspace on "new" rifles. And the field gauge is for checking older worn rifles for maximum allowable headspace. I adjusted the Hornady cartridge case headspace gauge by placing a .011 feeler gauge between the red and silver sections of the gauge. Meaning the unadjusted Hornady gauge was reading .011 shorter than the Field gauge. Yes the Hornady gauge is just a comparator gauge "BUT" if adjusted it will give very close measurements to the actual chamber length. Your head clearance is the "air space" between the rear of the case and the bolt face. And how far the case must stretch to meet the bolt face when fired. And your shoulder bump is the same approximate distance as you head clearance, "IF" the sizing die is adjusted correctly. [IMG]https://i.imgur.com/HK76WCp.jpg[/IMG] [/QUOTE]
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Reloading
Headspace 10-round sample
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