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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
"Over Bore"??
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<blockquote data-quote="steve smith" data-source="post: 21672" data-attributes="member: 110"><p>Wapi-T</p><p></p><p>Like Darryl said a cartridge being overbore is easiest to see in the very extreme cases.</p><p>A 50BMG is such a case, w/a case capacity of 290+ gr of H20 and average load being 220-240gr of powder. SSK industries now manufactures rifles chambered in 50Peacekeeper, <img src="http://www.sskindustries.com/images/3bullets.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /> A BMG flanked by 2 Peackeeper rounds. A 460WBY case necked up to .510 cal. With a shorter barrel and half the powder they can achieve over 80% of the BMGs velocity with the same bullets.</p><p></p><p>A little more scaled down is my 270-300Ultra, It has a capacity of about 112gr H2O, vs a 270win w/a cap of 67gr H20. My ultra in a 30" barrel uses 103gr powder to push a bullet 3750fps while my 270win in a 28" barrel pushed the same bullet 3200fps using only 58gr of powder. The ultra takes 178% of the powder of the 270win (that's a 78%increase) to push the bullet 118% of the velocity of 270win( that's an increase of only 18%). It took 45gr extra powder to increase 550fps. That is very overbore, and very inefficient. </p><p></p><p>The most efficient cases are the smallest, a 300whisper, for example, can push a 240gr bullet around 12-1300 fps using 13-15gr of powder where a 300 Ulra pushes the same bullet 3000fps w/close to 100gr powder. The whisper has 43% of the ultras velocity while using 15% of the ultras powder. That's alot of speed for not alot of powder.</p></blockquote><p></p>
[QUOTE="steve smith, post: 21672, member: 110"] Wapi-T Like Darryl said a cartridge being overbore is easiest to see in the very extreme cases. A 50BMG is such a case, w/a case capacity of 290+ gr of H20 and average load being 220-240gr of powder. SSK industries now manufactures rifles chambered in 50Peacekeeper, [img]http://www.sskindustries.com/images/3bullets.jpg[/img] A BMG flanked by 2 Peackeeper rounds. A 460WBY case necked up to .510 cal. With a shorter barrel and half the powder they can achieve over 80% of the BMGs velocity with the same bullets. A little more scaled down is my 270-300Ultra, It has a capacity of about 112gr H2O, vs a 270win w/a cap of 67gr H20. My ultra in a 30" barrel uses 103gr powder to push a bullet 3750fps while my 270win in a 28" barrel pushed the same bullet 3200fps using only 58gr of powder. The ultra takes 178% of the powder of the 270win (that's a 78%increase) to push the bullet 118% of the velocity of 270win( that's an increase of only 18%). It took 45gr extra powder to increase 550fps. That is very overbore, and very inefficient. The most efficient cases are the smallest, a 300whisper, for example, can push a 240gr bullet around 12-1300 fps using 13-15gr of powder where a 300 Ulra pushes the same bullet 3000fps w/close to 100gr powder. The whisper has 43% of the ultras velocity while using 15% of the ultras powder. That's alot of speed for not alot of powder. [/QUOTE]
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