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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
what do groups mean?
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<blockquote data-quote="royinidaho" data-source="post: 488007" data-attributes="member: 2011"><p>Ur gonna open a can of worms with this one, I'm bettin'.<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /> There will be plenty of subjective responses and personal experience. All responses will be good for consideration.</p><p></p><p>Initial considerations/assumptions upon which my "experience" is based.</p><p></p><p></p><ol> <li data-xf-list-type="ol">the right load</li> </ol><p></p><ul> <li data-xf-list-type="ul">Correct combination of powder/primer/bullet/seating depth that particular rifle.</li> </ul><p></p><ol> <li data-xf-list-type="ol">Rifle is 'properly' bedded</li> </ol><p></p><ul> <li data-xf-list-type="ul">action is bedded</li> <li data-xf-list-type="ul">barrel is bedded up the chamber (2" or so)</li> <li data-xf-list-type="ul">barrel is free floated from there to the end <strong>OR</strong></li> <li data-xf-list-type="ul">barrel is bedded to the end of the forearm.</li> </ul><p></p><ol> <li data-xf-list-type="ol">Proper bore cleaning regimen.</li> </ol><p></p><ol> <li data-xf-list-type="ol">Scope properly mounted <strong>AND</strong></li> </ol><p></p><ul> <li data-xf-list-type="ul">Focus and parallax properly adjusted</li> </ul><p></p><ol> <li data-xf-list-type="ol">Proper shooting skill have been developed.</li> </ol><p>THEN: Many many times I have seen '|" shaped groups turn into '--' shaped groups with the addition or subtraction of a few grains of powder. When that happens I try various powder charges somewhere around half way between these two charge weights and nearly always end up with a '.' shaped group.</p><p></p><p>In even more <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /> words when I get a nice small vertical string I add powder. 2 grains or so in for an example rifle (uses 100 grain charges) if the result is a horizontal shaped group, I reduce the load by a grain and can bet that the resulting group will approach a uniform 3 shot triangle shape. This usually works.</p></blockquote><p></p>
[QUOTE="royinidaho, post: 488007, member: 2011"] Ur gonna open a can of worms with this one, I'm bettin'.:) There will be plenty of subjective responses and personal experience. All responses will be good for consideration. Initial considerations/assumptions upon which my "experience" is based. [LIST=1] [*]the right load [/LIST] [LIST] [*]Correct combination of powder/primer/bullet/seating depth that particular rifle. [/LIST] [LIST=1] [*]Rifle is 'properly' bedded [/LIST] [LIST] [*]action is bedded [*]barrel is bedded up the chamber (2" or so) [*]barrel is free floated from there to the end [B]OR[/B] [*]barrel is bedded to the end of the forearm. [/LIST] [LIST=1] [*]Proper bore cleaning regimen. [/LIST] [LIST=1] [*]Scope properly mounted [B]AND[/B] [/LIST] [LIST] [*]Focus and parallax properly adjusted [/LIST] [LIST=1] [*]Proper shooting skill have been developed. [/LIST] THEN: Many many times I have seen '|" shaped groups turn into '--' shaped groups with the addition or subtraction of a few grains of powder. When that happens I try various powder charges somewhere around half way between these two charge weights and nearly always end up with a '.' shaped group. In even more :) words when I get a nice small vertical string I add powder. 2 grains or so in for an example rifle (uses 100 grain charges) if the result is a horizontal shaped group, I reduce the load by a grain and can bet that the resulting group will approach a uniform 3 shot triangle shape. This usually works. [/QUOTE]
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