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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Do cartridge case dimensions affect recoil?
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<blockquote data-quote="Mikecr" data-source="post: 441591" data-attributes="member: 1521"><p>I don't know that anyone claimed short-fat cases come about -for less recoil, but they do produce less than some longer cases of the same capacity. </p><p></p><p>If you look at a 30-06 it's fairly easy to see that there is almost nothing holding back the powder columb. This cartridge is an elongated funnel. So a good amount of powder mass combines with the bullet mass and this would need to be accounted for in accurate recoil calcs(it isn't). This bullet chasing powder burns slower as it's under less pressure when finally burned way down the bore. This increases muzzle pressure, producing a big ole fireball, ugly bullet release, and even more percieved recoil. Classic case in low efficiency..</p><p></p><p>On the flipside, a very high efficiency cartridge/load burns completely, and at a consistent rate, before the bullet reaches the muzzle. The muzzle pressure is lower so it jumps less, and bullet release is cleaner.</p><p>You will never see this with a long, skinny, high body taper, low shoulder angle case -for a given capacity.</p><p>To do this means faster powder, or slower powder burned in or very near the chamber -as quickly as can be gotten away with. Highly bottle-necked cases contain powder better to make it burn right there.</p><p>Examples of this were explored by Gibbs with front ignition, and I believe Vaughn validated it in 'Accuracy Facts'.</p><p></p><p>We can follow this observing winning 1kyd IBS LG BR cartridges and see what settles into easiest to shoot(quickly) while producing satisfatory results. High recoil fire breathing cartridges won't do well here, and they fade from the lineup.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 441591, member: 1521"] I don't know that anyone claimed short-fat cases come about -for less recoil, but they do produce less than some longer cases of the same capacity. If you look at a 30-06 it's fairly easy to see that there is almost nothing holding back the powder columb. This cartridge is an elongated funnel. So a good amount of powder mass combines with the bullet mass and this would need to be accounted for in accurate recoil calcs(it isn't). This bullet chasing powder burns slower as it's under less pressure when finally burned way down the bore. This increases muzzle pressure, producing a big ole fireball, ugly bullet release, and even more percieved recoil. Classic case in low efficiency.. On the flipside, a very high efficiency cartridge/load burns completely, and at a consistent rate, before the bullet reaches the muzzle. The muzzle pressure is lower so it jumps less, and bullet release is cleaner. You will never see this with a long, skinny, high body taper, low shoulder angle case -for a given capacity. To do this means faster powder, or slower powder burned in or very near the chamber -as quickly as can be gotten away with. Highly bottle-necked cases contain powder better to make it burn right there. Examples of this were explored by Gibbs with front ignition, and I believe Vaughn validated it in 'Accuracy Facts'. We can follow this observing winning 1kyd IBS LG BR cartridges and see what settles into easiest to shoot(quickly) while producing satisfatory results. High recoil fire breathing cartridges won't do well here, and they fade from the lineup. [/QUOTE]
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Do cartridge case dimensions affect recoil?
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