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Rifles, Reloading, Optics, Equipment
Reloading
Purpose of bullet jump
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<blockquote data-quote="nmbarta" data-source="post: 1794820" data-attributes="member: 78438"><p>Your basically making adjustments to the pressure curve when you play with seating depth.</p><p></p><p>As you seat deeper you decrease case capacity which increases pressure, but at the same time you allow for more momentum when the bullet engages the lands, which decreases pressure.</p><p>So, you may find two loads at different seating depth and powder charges that have the same peak pressure, but the time that shot is at peak pressure has changed. You've changed the shape of the pressure curve if your looking at a graph.</p><p></p><p>The shortest answer I could give, is pressure curve. I believe that is what is being "adjusted" the most by changing your seating depth, this will change exit timing, but I don't think it's just velocity that causing the change in exit timing as the harmonics have been changed as well. I'd have to be quite a bit smarter than I am to completely understand everything going on with internal ballistics, but changing your seating depth probably has some effect on just about everything internally.</p></blockquote><p></p>
[QUOTE="nmbarta, post: 1794820, member: 78438"] Your basically making adjustments to the pressure curve when you play with seating depth. As you seat deeper you decrease case capacity which increases pressure, but at the same time you allow for more momentum when the bullet engages the lands, which decreases pressure. So, you may find two loads at different seating depth and powder charges that have the same peak pressure, but the time that shot is at peak pressure has changed. You've changed the shape of the pressure curve if your looking at a graph. The shortest answer I could give, is pressure curve. I believe that is what is being "adjusted" the most by changing your seating depth, this will change exit timing, but I don't think it's just velocity that causing the change in exit timing as the harmonics have been changed as well. I'd have to be quite a bit smarter than I am to completely understand everything going on with internal ballistics, but changing your seating depth probably has some effect on just about everything internally. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Purpose of bullet jump
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