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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
5mm smc
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<blockquote data-quote="Fiftydriver" data-source="post: 159243" data-attributes="member: 10"><p>I would have to agree on the comments already mentioned about barrel heat and life.</p><p></p><p>Only way to keep the barrel significantly cooler is to A. reduce your powder charge or B. keep the powder in the case while it is burning.</p><p></p><p>No matter what you do, with a rear ignition case design, the powder will be pushed into the throat while it is burning to some degree or another. The larger the powder charge, the more will burn in the throat/bore.</p><p></p><p>Forward ignition is the only way to stop this. THis system uses a long flash tube to carry the primer flame up to a location right under the base of the bullet. The powder near the bullet ignites first and then the rest of the powder burns from the case shoulder back to the rear of the case. </p><p></p><p>Basically speaking, no powder leaves the case in solid form while its burning, only gas from the burnt powder in the case.</p><p></p><p>I have tested this with many rounds and can say without a doubt it dramatically reduces bore temps. Only problem, in small caliber cartridges, it is pretty much impractical to use this ignition system simply because the small dimensions are to hard to work with installing the flash tubes.</p><p></p><p>As far as why a short fat case will generate more velocity then a long skinny one of equal length:</p><p></p><p>1. shorter case design has more usible barrel length from where the bullet is seated to the muzzle.</p><p></p><p>2. A shorter, fatter powder charge has a larger cross section in the powder charge column. As such, more powder is exposed to the primer ignition to start with and more powder volume is ignited as the powder burns so the powder simply burns larger amounts at a quicker rate then with a long skinny design.</p><p></p><p>My opinion for sure but that is why I think it happens.</p><p></p><p>To be honest, if you give the two rounds the exact same usible barrel length, the different will be smaller just with that.</p><p></p><p>Kirby Allen(50)</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 159243, member: 10"] I would have to agree on the comments already mentioned about barrel heat and life. Only way to keep the barrel significantly cooler is to A. reduce your powder charge or B. keep the powder in the case while it is burning. No matter what you do, with a rear ignition case design, the powder will be pushed into the throat while it is burning to some degree or another. The larger the powder charge, the more will burn in the throat/bore. Forward ignition is the only way to stop this. THis system uses a long flash tube to carry the primer flame up to a location right under the base of the bullet. The powder near the bullet ignites first and then the rest of the powder burns from the case shoulder back to the rear of the case. Basically speaking, no powder leaves the case in solid form while its burning, only gas from the burnt powder in the case. I have tested this with many rounds and can say without a doubt it dramatically reduces bore temps. Only problem, in small caliber cartridges, it is pretty much impractical to use this ignition system simply because the small dimensions are to hard to work with installing the flash tubes. As far as why a short fat case will generate more velocity then a long skinny one of equal length: 1. shorter case design has more usible barrel length from where the bullet is seated to the muzzle. 2. A shorter, fatter powder charge has a larger cross section in the powder charge column. As such, more powder is exposed to the primer ignition to start with and more powder volume is ignited as the powder burns so the powder simply burns larger amounts at a quicker rate then with a long skinny design. My opinion for sure but that is why I think it happens. To be honest, if you give the two rounds the exact same usible barrel length, the different will be smaller just with that. Kirby Allen(50) [/QUOTE]
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