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Long Range Hunting & Shooting
7 PRC Powder burn rate vs velocity? I don't understand.
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<blockquote data-quote="ObiWanKannoli" data-source="post: 3078207" data-attributes="member: 116692"><p>Easy way to put is that the burn rate is the same or slower, but the energy content is great. So much so that even with a slower burn rate you'll see greater velocities. </p><p></p><p>These are highly simplified numbers...howrver let's say your burn rate is "1" with powder A which has "1" energy content and powder B with "1.3" energy content but burn rate "0.9". B will still be producing more velocity. The reality is both burn rates are still fast enough to complete burn in your barrel, so the burn rate is irrelevant then. Net net, it's more energy. The pressure curve is different between the two. One may spike a lot more quickly to a lower value, while the other may take 10% longer for a 20-30% greater peak pressure. That extra 10% is still within the barrel, and the barrel length is still giving your bullet enough time to make use of the extra pressure and speed up more.</p></blockquote><p></p>
[QUOTE="ObiWanKannoli, post: 3078207, member: 116692"] Easy way to put is that the burn rate is the same or slower, but the energy content is great. So much so that even with a slower burn rate you'll see greater velocities. These are highly simplified numbers...howrver let's say your burn rate is "1" with powder A which has "1" energy content and powder B with "1.3" energy content but burn rate "0.9". B will still be producing more velocity. The reality is both burn rates are still fast enough to complete burn in your barrel, so the burn rate is irrelevant then. Net net, it's more energy. The pressure curve is different between the two. One may spike a lot more quickly to a lower value, while the other may take 10% longer for a 20-30% greater peak pressure. That extra 10% is still within the barrel, and the barrel length is still giving your bullet enough time to make use of the extra pressure and speed up more. [/QUOTE]
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7 PRC Powder burn rate vs velocity? I don't understand.
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