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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Understanding cartridge efficiency
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<blockquote data-quote="Jfightingfalcon" data-source="post: 1914891" data-attributes="member: 113799"><p>I think the discussion really boils down to what people perceive as efficiency. To most, I suspect it's when they put X grains of powder into one case and move an identical bullet through an identical barrel a given number of feet per second faster (and without SIGNS of excessive pressure) than if they ran that same powder charge in another case. Is this efficiency? Scientifically speaking, no doubt: getting more kinetic energy from the same reaction. However, to a reloader, the real question lies in where the bonus kinetic energy is coming from. Does this hypothetically more efficient case manage the pressure curve better, or does it produce more pressure with the same powder charge. If I may voice my rather inexperienced opinion in this gathering of veterans, I strongly suspect it's the latter, and the only real advantage of 'modern' case designs (ballistically speaking, I understand magazine length, ease of reloading, etc) is their ability to produce and tolerate higher pressures, thereby generating more velocity. Unfortunately the equipment required to properly test any of our theories is prohibitively expensive. Besides, what would wildcatters argue about?!</p></blockquote><p></p>
[QUOTE="Jfightingfalcon, post: 1914891, member: 113799"] I think the discussion really boils down to what people perceive as efficiency. To most, I suspect it's when they put X grains of powder into one case and move an identical bullet through an identical barrel a given number of feet per second faster (and without SIGNS of excessive pressure) than if they ran that same powder charge in another case. Is this efficiency? Scientifically speaking, no doubt: getting more kinetic energy from the same reaction. However, to a reloader, the real question lies in where the bonus kinetic energy is coming from. Does this hypothetically more efficient case manage the pressure curve better, or does it produce more pressure with the same powder charge. If I may voice my rather inexperienced opinion in this gathering of veterans, I strongly suspect it's the latter, and the only real advantage of 'modern' case designs (ballistically speaking, I understand magazine length, ease of reloading, etc) is their ability to produce and tolerate higher pressures, thereby generating more velocity. Unfortunately the equipment required to properly test any of our theories is prohibitively expensive. Besides, what would wildcatters argue about?! [/QUOTE]
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Understanding cartridge efficiency
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