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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Help me design a .338-375CT projectile
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<blockquote data-quote="groper" data-source="post: 410759" data-attributes="member: 12550"><p>So far i have come up these design values;</p><p></p><p>Bullet caliber = .375</p><p>Bullet weight = 400grns</p><p>Sectional density = .406<img src="http://www.longrangehunting.com/forums/images/styles/longrangehunting/editor/smilie.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>OAL = 6 calibers (in .375cal thats about 57mm or just over 2 1/4in)</p><p>Nose length = 3.5 calibers</p><p>BT length = 0.9 calibers</p><p>Base Dia = 0.75 calibers</p><p>Secant Radius = 18 calibers</p><p></p><p>Calculated BC brackets are - 1.108 @ 2791fps, 1.011 @ 1786fps, 0.829 @ 1228fps and ideal twist rate is 9.9in.</p><p></p><p>Im undecided about the Meplat whether do go for a AL tip or a simple HP like a SMK... you get a higher BC with the AL tip but adds cost and complexity by using them.</p><p></p><p>Can anybody see any problems by using such a design outlined above? Once i have settled on a design, its a simple process to order some custom dies and get started <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p></blockquote><p></p>
[QUOTE="groper, post: 410759, member: 12550"] So far i have come up these design values; Bullet caliber = .375 Bullet weight = 400grns Sectional density = .406[IMG]http://www.longrangehunting.com/forums/images/styles/longrangehunting/editor/smilie.gif[/IMG] OAL = 6 calibers (in .375cal thats about 57mm or just over 2 1/4in) Nose length = 3.5 calibers BT length = 0.9 calibers Base Dia = 0.75 calibers Secant Radius = 18 calibers Calculated BC brackets are - 1.108 @ 2791fps, 1.011 @ 1786fps, 0.829 @ 1228fps and ideal twist rate is 9.9in. Im undecided about the Meplat whether do go for a AL tip or a simple HP like a SMK... you get a higher BC with the AL tip but adds cost and complexity by using them. Can anybody see any problems by using such a design outlined above? Once i have settled on a design, its a simple process to order some custom dies and get started :) [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Help me design a .338-375CT projectile
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