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Rifles, Reloading, Optics, Equipment
Reloading
seating depth increments
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<blockquote data-quote="Mikecr" data-source="post: 1306374" data-attributes="member: 1521"><p>In your mind, separate seating from powder, and understand that they both, independently, affect overall results.</p><p>Two paths:</p><p>1. Pull an untested seating number out of your butt, powder develop with it, then go back to fiddling with it. But full seating testing will not work there, as big changes in seating will collapse your powder results. So you split differences back & forth, chasing your tail,, or you accept whatever you ended up with.</p><p>2. Back away from any intended charge to do full seating testing. Then go to powder/incremental load development with a ladder and/or OCW and that best rough seating. Pick a powder node, and tweak seating for tightest group shape. The results are either good enough with chosen components, or they aren't.</p><p></p><p>There are other things about seating you need to mind. For one, MV could go up or down with deeper seating, it depends. If you FL size necks then deeper seating could cause MV to go up. Way up. If you partial length size necks, then deeper seating could cause MV to go down. This, dependent on your CBTO/land relationship. Then you have annealed/hardened condition of necks, adjusting tension, affecting MV slightly & barrel timing more.</p><p></p><p>Keep in mind that MV & barrel timing are not in direct relationship. And that there are multiple timings affecting results. </p><p>You have at least:</p><p>-Powder burn timing, affecting muzzle pressures, and SD, and overall forgiveness.</p><p>-Barrel whip timing, affecting accuracy at different distances.</p><p>-Barrel vibration timing, affecting bore diameter on bullet release.</p><p>-Shooting system timing, affecting where the gun is pointed by the time a bullet is released.</p><p>So a tune with one powder at this & that distance & rest can produce considerably different MV than tune with another powder.</p><p>But all the while, best rough seating holds right where it is, and that's why seating should be handled separately.</p><p></p><p>Yes, for your gun, of course.</p><p></p><p>Yes, and no. I don't ever give up accuracy for SD, or for 'forgiving'. I go for best accuracy even if leading to razor edge tolerances, and rely on my best in reloading, and planned/limited to validated shooting. </p><p>Also, I would not think that seating depth would be the right choice for a powder tuning attribute(like SD).</p><p>I use QuickLoad 'what ifs' in choosing fastest powder that fills the case by MyMax pressure(which I also tested for during second round of fire forming). And I bounce the powder choice off posted loads at Reloader'sNest, and forums. I load incrementally for ladder shooting at 300yds.</p><p>Once I have best hot precision at 300, and it's good enough, I move to cold bore accuracy testing/tweaking at 200yds.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 1306374, member: 1521"] In your mind, separate seating from powder, and understand that they both, independently, affect overall results. Two paths: 1. Pull an untested seating number out of your butt, powder develop with it, then go back to fiddling with it. But full seating testing will not work there, as big changes in seating will collapse your powder results. So you split differences back & forth, chasing your tail,, or you accept whatever you ended up with. 2. Back away from any intended charge to do full seating testing. Then go to powder/incremental load development with a ladder and/or OCW and that best rough seating. Pick a powder node, and tweak seating for tightest group shape. The results are either good enough with chosen components, or they aren't. There are other things about seating you need to mind. For one, MV could go up or down with deeper seating, it depends. If you FL size necks then deeper seating could cause MV to go up. Way up. If you partial length size necks, then deeper seating could cause MV to go down. This, dependent on your CBTO/land relationship. Then you have annealed/hardened condition of necks, adjusting tension, affecting MV slightly & barrel timing more. Keep in mind that MV & barrel timing are not in direct relationship. And that there are multiple timings affecting results. You have at least: -Powder burn timing, affecting muzzle pressures, and SD, and overall forgiveness. -Barrel whip timing, affecting accuracy at different distances. -Barrel vibration timing, affecting bore diameter on bullet release. -Shooting system timing, affecting where the gun is pointed by the time a bullet is released. So a tune with one powder at this & that distance & rest can produce considerably different MV than tune with another powder. But all the while, best rough seating holds right where it is, and that's why seating should be handled separately. Yes, for your gun, of course. Yes, and no. I don't ever give up accuracy for SD, or for 'forgiving'. I go for best accuracy even if leading to razor edge tolerances, and rely on my best in reloading, and planned/limited to validated shooting. Also, I would not think that seating depth would be the right choice for a powder tuning attribute(like SD). I use QuickLoad 'what ifs' in choosing fastest powder that fills the case by MyMax pressure(which I also tested for during second round of fire forming). And I bounce the powder choice off posted loads at Reloader'sNest, and forums. I load incrementally for ladder shooting at 300yds. Once I have best hot precision at 300, and it's good enough, I move to cold bore accuracy testing/tweaking at 200yds. [/QUOTE]
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