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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
7mm Rem Berger 180gr/168 difference?
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<blockquote data-quote="BryanLitz" data-source="post: 360718" data-attributes="member: 7848"><p>It is possible to calculate what velocity the 168 would need in order to match the wind deflection of the 180 (as AZshooter demonstrated).</p><p></p><p>However...</p><p></p><p>It's not a realistic comparison because you're talking about different chamber pressures. For example, it takes more pressure to get the 168 to 2940 fps than it does to get the 180 to 2800. Given equal chamber pressure (as the 180 at 2800), the 168 only achieves 2898 fps and the 180 is superior in terms of wind deflection. </p><p></p><p>Now if you jack the 168 up to 2940 fps to match the 180, the chamber pressure is equal to the 180 at 2840 fps, and the 180 is ahead again. </p><p></p><p>Nailing down the expected muzzle velocity of different weight bullets is an important part of any 'fair' ballistic analysis. It's hard to do because the chamber pressure assumption isn't always hard-and-fast. Sometimes the load isn't accurate at a certain chamber pressure and you're forced above or below the 'theoretical' velocity.</p><p></p><p>I hope this clarifies more than it confuses gun)</p><p></p><p>-Bryan</p></blockquote><p></p>
[QUOTE="BryanLitz, post: 360718, member: 7848"] It is possible to calculate what velocity the 168 would need in order to match the wind deflection of the 180 (as AZshooter demonstrated). However... It's not a realistic comparison because you're talking about different chamber pressures. For example, it takes more pressure to get the 168 to 2940 fps than it does to get the 180 to 2800. Given equal chamber pressure (as the 180 at 2800), the 168 only achieves 2898 fps and the 180 is superior in terms of wind deflection. Now if you jack the 168 up to 2940 fps to match the 180, the chamber pressure is equal to the 180 at 2840 fps, and the 180 is ahead again. Nailing down the expected muzzle velocity of different weight bullets is an important part of any 'fair' ballistic analysis. It's hard to do because the chamber pressure assumption isn't always hard-and-fast. Sometimes the load isn't accurate at a certain chamber pressure and you're forced above or below the 'theoretical' velocity. I hope this clarifies more than it confuses gun) -Bryan [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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7mm Rem Berger 180gr/168 difference?
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