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Rifles, Reloading, Optics, Equipment
Reloading
How did I get an extra 150fps? 300Wby
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<blockquote data-quote="Bart B" data-source="post: 871324" data-attributes="member: 5302"><p>I think there will be different peak pressures for different amounts of bullet jump to the lands.</p><p></p><p><img src="http://i2.photobucket.com/albums/y17/steve4102/seatingdepthvpressure.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>And as 30 caliber bullets' diameters range from about 3070" to over .3090" and their ogive shape diameters at any place in that range will contact the rifling anywhere in it depending on the chamber's throat diameter and leade angle on the rifling from that diameter past groove diameter (which is often smaller than the bullet's diameter) down to bore diameter. And bullets with a longer bearing surface will have a longer time of being engraved by the rifling and that'll cause different pressures with them.</p></blockquote><p></p>
[QUOTE="Bart B, post: 871324, member: 5302"] I think there will be different peak pressures for different amounts of bullet jump to the lands. [img]http://i2.photobucket.com/albums/y17/steve4102/seatingdepthvpressure.jpg[/img] And as 30 caliber bullets' diameters range from about 3070" to over .3090" and their ogive shape diameters at any place in that range will contact the rifling anywhere in it depending on the chamber's throat diameter and leade angle on the rifling from that diameter past groove diameter (which is often smaller than the bullet's diameter) down to bore diameter. And bullets with a longer bearing surface will have a longer time of being engraved by the rifling and that'll cause different pressures with them. [/QUOTE]
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Reloading
How did I get an extra 150fps? 300Wby
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