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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
How do I get my extreme deviation or spread DOWN?
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<blockquote data-quote="Bart B" data-source="post: 840550" data-attributes="member: 5302"><p>Here's some good info on making a 6.5x.284 drive pins; they're tinier than tacks.</p><p></p><p><a href="http://www.6mmbr.com/SixFive284.html" target="_blank">6.5-284 Cartridge Guide</a></p><p></p><p>Big velocity spreads can be caused by two things. </p><p></p><p>One's the firing pin spring; it needs to be at or a bit above factory specs. If yours is more than 3 years old, I would replace it.</p><p></p><p>The other's two fold and has to do with the primer not being dented enough. One cause is the firing pin's not sticking out of the bolt face enough to dent the primer cup deep enough for consistant detonation of the primer pellet. .060" is minimum and .065" about maximum. The other is your fired cases, if full length sized, have their shoulders set back too far. .002" bump back from fired position's enough.</p></blockquote><p></p>
[QUOTE="Bart B, post: 840550, member: 5302"] Here's some good info on making a 6.5x.284 drive pins; they're tinier than tacks. [url=http://www.6mmbr.com/SixFive284.html]6.5-284 Cartridge Guide[/url] Big velocity spreads can be caused by two things. One's the firing pin spring; it needs to be at or a bit above factory specs. If yours is more than 3 years old, I would replace it. The other's two fold and has to do with the primer not being dented enough. One cause is the firing pin's not sticking out of the bolt face enough to dent the primer cup deep enough for consistant detonation of the primer pellet. .060" is minimum and .065" about maximum. The other is your fired cases, if full length sized, have their shoulders set back too far. .002" bump back from fired position's enough. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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How do I get my extreme deviation or spread DOWN?
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