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Rifles, Reloading, Optics, Equipment
Reloading
Bullet seating depth?
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<blockquote data-quote="Whitesheep" data-source="post: 752281" data-attributes="member: 26409"><p>Wow, I know I post among giants when a 3/4" group @ 100 yrds is ho hum and 5 into a quarter sized hole at 100 yrds is not really considered good enough. Seriously, I am impressed.</p><p></p><p>As for C.O.L I agree on what has been said here and that the Hornady or other chamber length gauge is an important tool for working up loads truly customized not only to the rifle but to the bullet being loaded in a particular rifle.</p><p></p><p>In <em>"Getting the Best Precision and Accuracy from VLD bullets in <strong>Your Rifle</strong>"</em> Berger recommends the following:</p><p></p><p> <span style="font-family: 'Book Antiqua'"><span style="font-size: 10px">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:</span></span></p><p></p><ul> <li data-xf-list-type="ul"><span style="font-family: 'Book Antiqua'"><span style="font-size: 10px">.010 off the lands (jump) 6 rounds</span></span></li> <li data-xf-list-type="ul"><span style="font-family: 'Book Antiqua'"><span style="font-size: 10px">.050 off the lands (jump) 6 rounds</span></span></li> <li data-xf-list-type="ul"><span style="font-family: 'Book Antiqua'"><span style="font-size: 10px">.090 off the lands (jump) 6 rounds</span></span></li> <li data-xf-list-type="ul"><span style="font-family: 'Book Antiqua'"><span style="font-size: 10px">.130 off the lands (jump) 6 rounds</span></span></li> </ul><p> This is the procedure I have been following using 5 rounds (they fit in a standard ammunition box better) with good success. I use this method for all bullets manufacturers, not just Bergers. Note that success for me is 1 MOA, so if 3/4 is just ho hum for you, you may need to work within the 0.04 increments. PM me if you would like a copy of the Berger article.</p><p></p><p>I disagree with the comment about not "wasting money" on a chronograph and "backing into" the numbers using a load book. IMHO this sounds like a technique subject to large error and penny wisdom when pounds matter. A chrony is about $200 from Dillon <a href="http://http://www.dillonprecision.com/#/content/p/9/pid/24728/catid/32/CED_Millenium_Chronograph" target="_blank">http://www.dillonprecision.com/#/content/p/9/pid/24728/catid/32/CED_Millenium_Chronograph</a> and with $3000 rifles and $1500 scopes the norm for what is advertized on this site, $200 for a tool seems small change for someone really interested in long range accuracy. I find also fine it important to remember that BC is an estimate as well as an average over various velocities. Read the back of your Sierra loading manual for a good introduction to the problems/issues with BC. Only real live range tests with your gun and your loads matter.</p><p></p><p> Great discussion and happy shooting to all.gun)</p></blockquote><p></p>
[QUOTE="Whitesheep, post: 752281, member: 26409"] Wow, I know I post among giants when a 3/4" group @ 100 yrds is ho hum and 5 into a quarter sized hole at 100 yrds is not really considered good enough. Seriously, I am impressed. As for C.O.L I agree on what has been said here and that the Hornady or other chamber length gauge is an important tool for working up loads truly customized not only to the rifle but to the bullet being loaded in a particular rifle. In [I]"Getting the Best Precision and Accuracy from VLD bullets in [B]Your Rifle[/B]"[/I] Berger recommends the following: [FONT=Book Antiqua][SIZE=2]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:[/SIZE][/FONT] [LIST] [*][FONT=Book Antiqua][SIZE=2].010 off the lands (jump) 6 rounds[/SIZE][/FONT] [*][FONT=Book Antiqua][SIZE=2].050 off the lands (jump) 6 rounds[/SIZE][/FONT] [*][FONT=Book Antiqua][SIZE=2].090 off the lands (jump) 6 rounds[/SIZE][/FONT] [*][FONT=Book Antiqua][SIZE=2].130 off the lands (jump) 6 rounds[/SIZE][/FONT] [/LIST] This is the procedure I have been following using 5 rounds (they fit in a standard ammunition box better) with good success. I use this method for all bullets manufacturers, not just Bergers. Note that success for me is 1 MOA, so if 3/4 is just ho hum for you, you may need to work within the 0.04 increments. PM me if you would like a copy of the Berger article. I disagree with the comment about not "wasting money" on a chronograph and "backing into" the numbers using a load book. IMHO this sounds like a technique subject to large error and penny wisdom when pounds matter. A chrony is about $200 from Dillon [URL="http://http://www.dillonprecision.com/#/content/p/9/pid/24728/catid/32/CED_Millenium_Chronograph"]http://www.dillonprecision.com/#/content/p/9/pid/24728/catid/32/CED_Millenium_Chronograph[/URL] and with $3000 rifles and $1500 scopes the norm for what is advertized on this site, $200 for a tool seems small change for someone really interested in long range accuracy. I find also fine it important to remember that BC is an estimate as well as an average over various velocities. Read the back of your Sierra loading manual for a good introduction to the problems/issues with BC. Only real live range tests with your gun and your loads matter. Great discussion and happy shooting to all.gun) [/QUOTE]
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