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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Advice required on which 338.
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<blockquote data-quote="jwp475" data-source="post: 220379" data-attributes="member: 3776"><p>The Lapua wb site has an article tilted "Story Of The 338 Lapua" </p><p></p><p> From the web site</p><p></p><p> The reason for .416 Rigby case being a good prototype and parent case, but not the actual choice for the new caliber case was quite clear. For the .338/416 cartridge the velocity of a 16,2 g bullet was 915m/s. A completely different case designed for a higher pressure level was clearly needed. The original Rigby .416 case had a rough 3000 Bar pressure case. The new cartridge was designed for over 4000 Bar pressures. The original pressure definition based on the deformation of the copper pellet method - the crusher method - was specified in the beginning into 56000 CUPs (about 3900 bar). When CIP moved to the piezo transducer period, a mistake was made somewhere resulting in the pressure medium for .338 Lapua Magnum to stay in the 4700 Bar level, even thought the correct level is in the 4200 Bars. </p><p></p><p></p><p><a href="http://www.lapua.com/index.php?id=889" target="_blank">http://www.lapua.com/index.php?id=889</a></p></blockquote><p></p>
[QUOTE="jwp475, post: 220379, member: 3776"] The Lapua wb site has an article tilted "Story Of The 338 Lapua" From the web site The reason for .416 Rigby case being a good prototype and parent case, but not the actual choice for the new caliber case was quite clear. For the .338/416 cartridge the velocity of a 16,2 g bullet was 915m/s. A completely different case designed for a higher pressure level was clearly needed. The original Rigby .416 case had a rough 3000 Bar pressure case. The new cartridge was designed for over 4000 Bar pressures. The original pressure definition based on the deformation of the copper pellet method - the crusher method - was specified in the beginning into 56000 CUPs (about 3900 bar). When CIP moved to the piezo transducer period, a mistake was made somewhere resulting in the pressure medium for .338 Lapua Magnum to stay in the 4700 Bar level, even thought the correct level is in the 4200 Bars. [url]http://www.lapua.com/index.php?id=889[/url] [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Advice required on which 338.
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