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The Range
Ammo & Reloading
Annealing with Hard numbers
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<blockquote data-quote="swampratt" data-source="post: 2845466" data-attributes="member: 15054"><p>I annealed the cases..And then I resized them.</p><p></p><p>All Neck ID measured the same .306"</p><p>After firing you loose a small amount of spring back as the case hardens..Some Brass Alloy mixes will show this more than others.</p><p>72 or 75 or 78 psi in a group of cases to me is perfectly acceptable..You get that 50 psi out of there as that will show up as the flier.</p><p></p><p>Then look at it like this..you shoot 100 yards you may see it as a smallish flier 1/2" away from the others maybe a lot more. </p><p>Now shoot that same deal at 300 yards.. could be 3" out of the group ..</p><p></p><p>The farther you shoot the more difference seating pressures will make.</p><p>In my mind 10% or less would be fine between seating forces.</p><p></p><p>Now I also took a fresh not touched Virgin Lapua 308 case and seated a bullet in it.</p><p>The neck was not chamfered.. the inside of the neck was NOT brushed ,, I left the rough Virgin surface.</p><p></p><p>As the bullet tried to get past the case mouth the gauge spiked to 60psi then the bullet went in abruptly and pressure dropped to 45 then spiked back up and down like chattering.. Not good in my book..If i brushed the neck and sized it things would be different..And they were as I did just that on another virgin case.</p><p></p><p>Nice even pressure climb to 72 PSI as the bullet seated.. as the bullets are scooting through the cases the pressure remains constant.</p><p>Those up and down spikes need to be eliminated.</p><p></p><p>Annealed cases will have more spring back and exhibit more holding forces on the bullet.</p><p>I used to think softer meant less tension.. but it is not soft vs hard as much as it is springback.</p><p></p><p>And again alloy makeup plays a role.. I do not think all manufactures have the same alloy. Fact I know they do not.</p><p> </p><p><a href="http://chemistry.about.com/od/alloys/a/Brass-Alloys.htm" target="_blank">http://chemistry.about.com/od/alloys/a/Brass-Alloys.htm</a></p></blockquote><p></p>
[QUOTE="swampratt, post: 2845466, member: 15054"] I annealed the cases..And then I resized them. All Neck ID measured the same .306" After firing you loose a small amount of spring back as the case hardens..Some Brass Alloy mixes will show this more than others. 72 or 75 or 78 psi in a group of cases to me is perfectly acceptable..You get that 50 psi out of there as that will show up as the flier. Then look at it like this..you shoot 100 yards you may see it as a smallish flier 1/2" away from the others maybe a lot more. Now shoot that same deal at 300 yards.. could be 3" out of the group .. The farther you shoot the more difference seating pressures will make. In my mind 10% or less would be fine between seating forces. Now I also took a fresh not touched Virgin Lapua 308 case and seated a bullet in it. The neck was not chamfered.. the inside of the neck was NOT brushed ,, I left the rough Virgin surface. As the bullet tried to get past the case mouth the gauge spiked to 60psi then the bullet went in abruptly and pressure dropped to 45 then spiked back up and down like chattering.. Not good in my book..If i brushed the neck and sized it things would be different..And they were as I did just that on another virgin case. Nice even pressure climb to 72 PSI as the bullet seated.. as the bullets are scooting through the cases the pressure remains constant. Those up and down spikes need to be eliminated. Annealed cases will have more spring back and exhibit more holding forces on the bullet. I used to think softer meant less tension.. but it is not soft vs hard as much as it is springback. And again alloy makeup plays a role.. I do not think all manufactures have the same alloy. Fact I know they do not. [url]http://chemistry.about.com/od/alloys/a/Brass-Alloys.htm[/url] [/QUOTE]
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