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Rifles, Reloading, Optics, Equipment
Reloading
Bullet seating depth?
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<blockquote data-quote="Whitesheep" data-source="post: 753248" data-attributes="member: 26409"><p>tt35 I couldn't agree more about having the right tools to measure COL to the ojive where it touches the lands in YOUR rifle. Even bullets from the same green box can be as much as 0.005" different in length. Yellow box variation is even greater in my experience with 7mm bullets.</p><p></p><p>I do have one rifle with very gradual leade into the lands that is difficult to get a consistent measurement of COL to ogive length. It ranges about 0.005" between just touching resistance and a full jam. Since this is far below the 0.040" steps I use in working up loads, it is more of interest than concern.</p><p></p><p>I have an article from Berger with their recommend testing for ideal COAL <em><span style="font-size: 10px">"Getting the Best Precision and Accuracy from VLD Bullets in <strong>Your Rifle</strong>"</span></em> which is attached. The crux of this document for hunters is:</p><p></p><p> [FLOATRIGHT]<em>Load 24 rounds at the following COAL if you are a <strong>hunter</strong> (pulling a bullet out of the case with your rifling while in the field can be a hunt ending event which must be avoided) or a competition shooter who worries about pulling a bullet during a match:</em></p><p><em> </em></p><ul> <li data-xf-list-type="ul"><em>.010 off the lands (jump) 6 rounds</em></li> <li data-xf-list-type="ul"><em>.050 off the lands (jump) 6 rounds</em></li> <li data-xf-list-type="ul"><em>.090 off the lands (jump) 6 rounds</em></li> <li data-xf-list-type="ul"><em>.130 off the lands (jump) 6 rounds</em></li> </ul><p><em> </em></p><p><em> <span style="font-family: 'Verdana'">Shoot 2 (separate) 3 shot groups in fair conditions to see how they group. The remarkable reality of this test is that one of these 4 COALs will outperform the other three by a considerable margin. Once you know which one of these 4 COAL shoots best then you can tweak the COAL +/- .002 or .005. Taking the time to set this test up will pay off when you find that your rifle is capable of shooting the VLD bullets very well (even at 100 yards).</span></em>[/FLOATRIGHT</p><p></p><p>While this did not work for me in the one rifle I tried it in (T/C PH .280 Rem) after burning up most of a yellow box, it has paid off with SGK's for this rifle and others.</p></blockquote><p></p>
[QUOTE="Whitesheep, post: 753248, member: 26409"] tt35 I couldn't agree more about having the right tools to measure COL to the ojive where it touches the lands in YOUR rifle. Even bullets from the same green box can be as much as 0.005" different in length. Yellow box variation is even greater in my experience with 7mm bullets. I do have one rifle with very gradual leade into the lands that is difficult to get a consistent measurement of COL to ogive length. It ranges about 0.005" between just touching resistance and a full jam. Since this is far below the 0.040" steps I use in working up loads, it is more of interest than concern. I have an article from Berger with their recommend testing for ideal COAL [I][SIZE=2]"Getting the Best Precision and Accuracy from VLD Bullets in [B]Your Rifle[/B]"[/SIZE][/I] which is attached. The crux of this document for hunters is: [FLOATRIGHT][I]Load 24 rounds at the following COAL if you are a [B]hunter[/B] (pulling a bullet out of the case with your rifling while in the field can be a hunt ending event which must be avoided) or a competition shooter who worries about pulling a bullet during a match: [/I] [LIST] [*][I].010 off the lands (jump) 6 rounds[/I] [*][I].050 off the lands (jump) 6 rounds[/I] [*][I].090 off the lands (jump) 6 rounds[/I] [*][I].130 off the lands (jump) 6 rounds[/I] [/LIST] [I] [FONT=Verdana]Shoot 2 (separate) 3 shot groups in fair conditions to see how they group. The remarkable reality of this test is that one of these 4 COALs will outperform the other three by a considerable margin. Once you know which one of these 4 COAL shoots best then you can tweak the COAL +/- .002 or .005. Taking the time to set this test up will pay off when you find that your rifle is capable of shooting the VLD bullets very well (even at 100 yards).[/FONT][/I][/FLOATRIGHT While this did not work for me in the one rifle I tried it in (T/C PH .280 Rem) after burning up most of a yellow box, it has paid off with SGK's for this rifle and others. [/QUOTE]
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