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260 Load Development
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<blockquote data-quote="swampratt" data-source="post: 2967131" data-attributes="member: 15054"><p>Think deeply about what you just said.</p><p>Or think deeply about what is happening during neck sizing only and firing then Full length sizing.</p><p></p><p>Not 1 time in 5 shots is your brass the same dimensions. Each time you neck size and fire the brass grows and grows until it gets to say shot #5 then it is almost fully sized to chamber dimensions.</p><p></p><p>I did much testing and measuring and found after shot 5 just neck sizing the case grew less in length .0005"</p><p>And the case was no harder to chamber at #20 neck sized vs #5.</p><p>So only then is the case really close to the same dimensions.</p><p></p><p>I anneal each time no matter which way I size the case. Now if your gun just shoots 1.25" groups you may not notice much.</p><p>What you will notice is that flier that opens a 1" group to 1.4" can sometimes be eliminated with annealing.</p><p></p><p>I did much testing there also.</p><p>Annealed vs not annealed.</p><p>I get the same bullet seating forces when I anneal.</p><p>Winchester .308 cases will have over 20 PSI different bullet seating force of annealed vs one time shot not annealed.</p><p></p><p>Annealing makes the bullet seating pressure go up. </p><p>You are probably thinking wait a minute the case neck is now softer why???</p><p></p><p>Because it has more spring back in the case neck after annealing. so as you stick a projectile into a case neck that is .002" smaller than the bullet diameter this added spring back acts like a clamp holding the bullet tighter.</p><p></p><p>You get a harder case it looses spring back and will have less bullet holding power.</p><p></p><p>This is not true for all makes of cases..Well it is .. But during testing the Lapua cases in .308 held their springiness all the way to 40 times fired and Not annealed.</p><p>85 PSI to seat a 1 time fired case and 80 PSI to seat the 40 time fired.</p><p>But even then My accuracy improved if i annealed the Lapua each time.</p><p></p><p>My FLS die is modified..I honed it so as to not size my case down but .001"-.002" anywhere.</p><p>So not your typical die.</p><p></p><p>You can have the die manufactured make a custom die for you,, send them a fired case and tell them what you want.</p><p>Lee dies are cheap and I do not mind honing one myself.</p><p></p><p>Sorry writing a book.</p><p></p><p>My guns were not as accurate just neck sizing.</p></blockquote><p></p>
[QUOTE="swampratt, post: 2967131, member: 15054"] Think deeply about what you just said. Or think deeply about what is happening during neck sizing only and firing then Full length sizing. Not 1 time in 5 shots is your brass the same dimensions. Each time you neck size and fire the brass grows and grows until it gets to say shot #5 then it is almost fully sized to chamber dimensions. I did much testing and measuring and found after shot 5 just neck sizing the case grew less in length .0005" And the case was no harder to chamber at #20 neck sized vs #5. So only then is the case really close to the same dimensions. I anneal each time no matter which way I size the case. Now if your gun just shoots 1.25" groups you may not notice much. What you will notice is that flier that opens a 1" group to 1.4" can sometimes be eliminated with annealing. I did much testing there also. Annealed vs not annealed. I get the same bullet seating forces when I anneal. Winchester .308 cases will have over 20 PSI different bullet seating force of annealed vs one time shot not annealed. Annealing makes the bullet seating pressure go up. You are probably thinking wait a minute the case neck is now softer why??? Because it has more spring back in the case neck after annealing. so as you stick a projectile into a case neck that is .002" smaller than the bullet diameter this added spring back acts like a clamp holding the bullet tighter. You get a harder case it looses spring back and will have less bullet holding power. This is not true for all makes of cases..Well it is .. But during testing the Lapua cases in .308 held their springiness all the way to 40 times fired and Not annealed. 85 PSI to seat a 1 time fired case and 80 PSI to seat the 40 time fired. But even then My accuracy improved if i annealed the Lapua each time. My FLS die is modified..I honed it so as to not size my case down but .001"-.002" anywhere. So not your typical die. You can have the die manufactured make a custom die for you,, send them a fired case and tell them what you want. Lee dies are cheap and I do not mind honing one myself. Sorry writing a book. My guns were not as accurate just neck sizing. [/QUOTE]
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