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Rifles, Reloading, Optics, Equipment
Gunsmithing
looks like gases leaking past shoulder?
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<blockquote data-quote="SidecarFlip" data-source="post: 887654" data-attributes="member: 39764"><p><strong>You did have a fiired round, the first one you fired would be the one to gage the headspace on.</strong> I just did exactly that with a new 6.5x55 Mauser chambered Sako. One round, popped the primer, labelled it (goes in the die box) and thats my check the datum round, that all subsequent rounds will be gaged to.</p><p> </p><p>The shoulder datum is the theoritical distance halfway between the lower case body, where the shoulder begins and the beginning of the neck and so long as you use the exact same insert bore to check with each time, the datum point becomes unimportant.</p><p> </p><p>The 'datum' is the check point on which the headspace gage rests when checking headspace.</p><p> </p><p>Of note is this 6.5x55 Sako. I bought 100 rounds of Lapua brass and checked the headspace against the fired round and had to bump back all the Lapua rounds 0.002 before they were even loaded for the first time.</p><p> </p><p>If they were headspacing within 0.001 I would have not bumped them, just ran the cases up in the die and allowed the expander ball to run through the necks because with most reloading brass, the necks get deformed in handling.</p><p> </p><p>For years I just reloaded and never got into this degree of consistency but as the distance increases, so does the degree of preparedness.</p><p> </p><p>I have a couple guys I build loads for and fiddle with their rifles, who want every round in the same hole. It's doable but things get a bit tedious.</p><p> </p><p>One of the 'one hole' guys just took a buck at 200 yards with his slug gun btw.</p></blockquote><p></p>
[QUOTE="SidecarFlip, post: 887654, member: 39764"] [B]You did have a fiired round, the first one you fired would be the one to gage the headspace on.[/B] I just did exactly that with a new 6.5x55 Mauser chambered Sako. One round, popped the primer, labelled it (goes in the die box) and thats my check the datum round, that all subsequent rounds will be gaged to. The shoulder datum is the theoritical distance halfway between the lower case body, where the shoulder begins and the beginning of the neck and so long as you use the exact same insert bore to check with each time, the datum point becomes unimportant. The 'datum' is the check point on which the headspace gage rests when checking headspace. Of note is this 6.5x55 Sako. I bought 100 rounds of Lapua brass and checked the headspace against the fired round and had to bump back all the Lapua rounds 0.002 before they were even loaded for the first time. If they were headspacing within 0.001 I would have not bumped them, just ran the cases up in the die and allowed the expander ball to run through the necks because with most reloading brass, the necks get deformed in handling. For years I just reloaded and never got into this degree of consistency but as the distance increases, so does the degree of preparedness. I have a couple guys I build loads for and fiddle with their rifles, who want every round in the same hole. It's doable but things get a bit tedious. One of the 'one hole' guys just took a buck at 200 yards with his slug gun btw. [/QUOTE]
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Gunsmithing
looks like gases leaking past shoulder?
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