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Rifles, Reloading, Optics, Equipment
Reloading
PPU brass
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<blockquote data-quote="bigedp51" data-source="post: 1730511" data-attributes="member: 28965"><p>Putting a feeler gauge "UNDER" the case in the shell holder will push the case further into the die by the thickness of the feeler gauge and push the shoulder back further. This would be the same as lapping the top of the shell holder and pushing the case further into the die for more shoulder bump. Meaning you use feeler gauges to find out how much to lap off the top of the shell holder.</p><p></p><p>I would never use a chamber reamer to increase the rifles headspace to make the Priv cases fit the chamber. But I would lap .003 or whatever is needed to let the shell holder push the case further into the die.</p><p></p><p>I'm 69 years old and have been reloading for over 46 years and only once had to lap a shell holder on a tightly headspaced rifle.</p><p></p><p>Below are the three lengths of headspace gauges and if you increase the rifles headspace .002 there is a very good chance the bolt will close on the NO-GO Gauge. Meaning the other brand cases will have more headspace and will stretch more when fired and increase the chances of case head separation.</p><p></p><p>Pacific Tool and Gauge offers three lengths of headspace gauges per rifle caliber. In order from the shortest to longest, they are: GO, NO-GO, and FIELD:</p><p></p><ol> <li data-xf-list-type="ol"><strong>GO:</strong> Corresponds to the minimum chamber dimensions. If a rifle closes on a GO gauge, the chamber will accept ammunition that is made to SAAMI's maximum specifications. The GO gauge is essential for checking a newly-reamed chamber in order to ensure a tight, accurate and safe chamber that will accept SAAMI maximum ammo. Although the GO gauge is necessary for a gunsmith or armorer, it usually has fewer applications for the collector or surplus firearms purchaser.<br /> <br /> </li> <li data-xf-list-type="ol"><strong>NO-GO:</strong> Corresponds to the maximum headspace Forster recommends for gunsmiths chambering new, bolt action rifles. This is NOT a SAAMI-maximum measurement. If a rifle closes on a NO-GO gauge, it may still be within SAAMI specifications or it may have excessive headspace. To determine if there is excessive headspace, the chamber should then be checked with a FIELD gauge. The NO-GO gauge is a valuable tool for checking a newly-reamed chamber in order to ensure a tight and accurate chamber.<br /> <br /> </li> <li data-xf-list-type="ol"><strong>FIELD:</strong> Corresponds to the longest safe headspace. If a rifle closes on a FIELD gauge, its chamber is dangerously close to, or longer than, SAAMI's specified maximum chamber size. If chamber headspace is excessive, the gun should be taken out of service until it has been inspected and repaired by a competent gunsmith. FIELD gauges are slightly shorter than the SAAMI maximum in order to give a small safety margin.</li> </ol></blockquote><p></p>
[QUOTE="bigedp51, post: 1730511, member: 28965"] Putting a feeler gauge "UNDER" the case in the shell holder will push the case further into the die by the thickness of the feeler gauge and push the shoulder back further. This would be the same as lapping the top of the shell holder and pushing the case further into the die for more shoulder bump. Meaning you use feeler gauges to find out how much to lap off the top of the shell holder. I would never use a chamber reamer to increase the rifles headspace to make the Priv cases fit the chamber. But I would lap .003 or whatever is needed to let the shell holder push the case further into the die. I'm 69 years old and have been reloading for over 46 years and only once had to lap a shell holder on a tightly headspaced rifle. Below are the three lengths of headspace gauges and if you increase the rifles headspace .002 there is a very good chance the bolt will close on the NO-GO Gauge. Meaning the other brand cases will have more headspace and will stretch more when fired and increase the chances of case head separation. Pacific Tool and Gauge offers three lengths of headspace gauges per rifle caliber. In order from the shortest to longest, they are: GO, NO-GO, and FIELD: [LIST=1] [*][B]GO:[/B] Corresponds to the minimum chamber dimensions. If a rifle closes on a GO gauge, the chamber will accept ammunition that is made to SAAMI’s maximum specifications. The GO gauge is essential for checking a newly-reamed chamber in order to ensure a tight, accurate and safe chamber that will accept SAAMI maximum ammo. Although the GO gauge is necessary for a gunsmith or armorer, it usually has fewer applications for the collector or surplus firearms purchaser. [*][B]NO-GO:[/B] Corresponds to the maximum headspace Forster recommends for gunsmiths chambering new, bolt action rifles. This is NOT a SAAMI-maximum measurement. If a rifle closes on a NO-GO gauge, it may still be within SAAMI specifications or it may have excessive headspace. To determine if there is excessive headspace, the chamber should then be checked with a FIELD gauge. The NO-GO gauge is a valuable tool for checking a newly-reamed chamber in order to ensure a tight and accurate chamber. [*][B]FIELD:[/B] Corresponds to the longest safe headspace. If a rifle closes on a FIELD gauge, its chamber is dangerously close to, or longer than, SAAMI’s specified maximum chamber size. If chamber headspace is excessive, the gun should be taken out of service until it has been inspected and repaired by a competent gunsmith. FIELD gauges are slightly shorter than the SAAMI maximum in order to give a small safety margin. [/LIST] [/QUOTE]
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