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Extreme Long Range Hunting & Shooting (ELR)
Let's talk about 2 mile cartridges
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<blockquote data-quote="ELR Researcher" data-source="post: 1222498" data-attributes="member: 19541"><p>EXPRESS:</p><p> </p><p>I never received the appropriate training to set up this problem but these seem to be at least some of the factors to be considered:</p><p> </p><p>1. Material spec - probably yield strength in psi.</p><p>2. The area of the projectile, adjusted for the fact that the full cross-section is not what will be impacting the target. The bullet manufacturer's meplat data is a start but certainly too small an area to correctly define the area over which the impact will be applied over time.</p><p>3. The energy still in the projectile at the target distance (JBM has that info).</p><p>4. An allowance for friction while piercing the target, i.e., the impact of material lubricity and surface coating, if any.</p><p>5. An allowance for the deformation of the projectile while piercing the target - the projectile will expand and thus be dealing with more and more target area as it tries to pierce the target. The type of the projectile material will have a significant effect on how well its shape is maintained - an AP vs soft lead point.</p><p> </p><p>Possibly Bryan Litz or the guy that produces the JBM calculators might find this problem interesting enough to spend a few minutes with it. Bryan's contact is <a href="mailto:info@abmammo.com">info@abmammo.com</a>. See the JBM contact page at <u><a href="http://www.jbmballistics.com/contact/contact.php" target="_blank">JBM Contact</a></u></p><p> </p><p>As one point of reference, URSA targets are 3/8" AR500 and we do not even dent them with 50 BMG at our starting distances (2054 or 2080 yards).</p></blockquote><p></p>
[QUOTE="ELR Researcher, post: 1222498, member: 19541"] EXPRESS: I never received the appropriate training to set up this problem but these seem to be at least some of the factors to be considered: 1. Material spec - probably yield strength in psi. 2. The area of the projectile, adjusted for the fact that the full cross-section is not what will be impacting the target. The bullet manufacturer's meplat data is a start but certainly too small an area to correctly define the area over which the impact will be applied over time. 3. The energy still in the projectile at the target distance (JBM has that info). 4. An allowance for friction while piercing the target, i.e., the impact of material lubricity and surface coating, if any. 5. An allowance for the deformation of the projectile while piercing the target - the projectile will expand and thus be dealing with more and more target area as it tries to pierce the target. The type of the projectile material will have a significant effect on how well its shape is maintained - an AP vs soft lead point. Possibly Bryan Litz or the guy that produces the JBM calculators might find this problem interesting enough to spend a few minutes with it. Bryan's contact is [EMAIL="info@abmammo.com"]info@abmammo.com[/EMAIL]. See the JBM contact page at [U][URL="http://www.jbmballistics.com/contact/contact.php"]JBM Contact[/URL][/U] As one point of reference, URSA targets are 3/8" AR500 and we do not even dent them with 50 BMG at our starting distances (2054 or 2080 yards). [/QUOTE]
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Let's talk about 2 mile cartridges
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