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Rifles, Reloading, Optics, Equipment
Reloading
Pressure Signs?
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<blockquote data-quote="Bowfishn" data-source="post: 1310832" data-attributes="member: 56875"><p>Makes no difference to me what someone wants to use for a load, without knowing his exact set up QL cannot be used to give an exact figure. My figure given were generic based of the 48 gr H2O case and 2.80" COAL, I am pretty sure QL used Lapua Cases so other than lot differences and actual chamber size 48 H2O should be close. </p><p></p><p>But there is no free lunch, either the chrono is off or factors are increasing pressure to increase speed, jam the lands increase pressure increased speed, tight bore increased pressure increased speed, low case volume increased pressure increased speed, powder burn rate high on lot increased pressure increased speed, extreme temperatures equal higher pressure and increased speed. There are also other factors that increase pressure and thus increase speed.</p><p></p><p>Point being to get extra speed with a certain powder you need to increase pressure, small percentage increases can be gained by using friction reducing coatings and increasing powder charge, seating longer without jamming lands if you have a long throat, then again adding powder charge. Using a case that has larger volume and then increasing powder charge. But none of the methods I believe will get you 100 fps and still stay within Cartridge Published Pressures.</p><p><img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite11" alt=":rolleyes:" title="Roll Eyes :rolleyes:" loading="lazy" data-shortname=":rolleyes:" /></p><p></p><p>Ran some new figures with a few tweaks to see what QL shows could be achieved by some using of the methods above.</p><p>If you could increase COAL to 2.890" without jamming lands and if your case volume was actually 48.5 gr H2O and if you used a coating such as HBN or Molly on your bullets 3006 fps could be obtained by 70,633 psi according to QL. Those tweaks dropped pressures listed by QL about 3,000 psi.</p><p>2.90"coal 49 gr H2O use the max increase shown in QL for friction proofing using coatings of .4 that would bring it to 69,209 psi</p></blockquote><p></p>
[QUOTE="Bowfishn, post: 1310832, member: 56875"] Makes no difference to me what someone wants to use for a load, without knowing his exact set up QL cannot be used to give an exact figure. My figure given were generic based of the 48 gr H2O case and 2.80" COAL, I am pretty sure QL used Lapua Cases so other than lot differences and actual chamber size 48 H2O should be close. But there is no free lunch, either the chrono is off or factors are increasing pressure to increase speed, jam the lands increase pressure increased speed, tight bore increased pressure increased speed, low case volume increased pressure increased speed, powder burn rate high on lot increased pressure increased speed, extreme temperatures equal higher pressure and increased speed. There are also other factors that increase pressure and thus increase speed. Point being to get extra speed with a certain powder you need to increase pressure, small percentage increases can be gained by using friction reducing coatings and increasing powder charge, seating longer without jamming lands if you have a long throat, then again adding powder charge. Using a case that has larger volume and then increasing powder charge. But none of the methods I believe will get you 100 fps and still stay within Cartridge Published Pressures. :rolleyes: Ran some new figures with a few tweaks to see what QL shows could be achieved by some using of the methods above. If you could increase COAL to 2.890" without jamming lands and if your case volume was actually 48.5 gr H2O and if you used a coating such as HBN or Molly on your bullets 3006 fps could be obtained by 70,633 psi according to QL. Those tweaks dropped pressures listed by QL about 3,000 psi. 2.90"coal 49 gr H2O use the max increase shown in QL for friction proofing using coatings of .4 that would bring it to 69,209 psi [/QUOTE]
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