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6.5 CM, 6.5 PRC Enough/Effective for Elk?
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<blockquote data-quote="bobinpa" data-source="post: 3044263" data-attributes="member: 10991"><p>It has almost nothing to do with bullet diameter and almost everything to do with energy and hydrostatic shock. For example, according to any common ballistic calculator:</p><p>A .264 dia. 140 grain Nosler Partition with a realistic muzzle velocity of 2900 FPS has 1268 Ft Lbs of energy at 500 yards (6.5 PRC)</p><p>A .338 dia. 250 grain Nosler Partition with a realistic muzzle velocity of 2900 FPS has 2200 Ft Lbs of energy at 500 yards (338 RUM)</p><p></p><p>A .264 dia. 140 grain Nosler Partition with a realistic muzzle velocity of 2600 FPS has 911 Ft Lbs of energy at 500 yards (6.5 Creedmoor)</p><p></p><p>The difference in downrange energy is so great that you have to add another gun, like a 6.5 Creedmoor for example, to get to the same amount of energy. 6.5 PRC + 6.5 Creedmoor = 338 RUM</p><p></p><p>Furthermore with a mere 5 mph crosswind, based on the data above:</p><p>The 6.5 PRC gets blown 9"</p><p>The 338 RUM gets blown 9"</p><p>The Creedmoor gets blown 12"</p><p></p><p>This is enough to turn a heart shot into a lung shot and a lung shot into a liver or gut shot. </p><p></p><p>I would not want to be the guy that had to make a 500 yard cross canyon shot and get blown off 9" - 12" by an undetectable 5 mph thermal draft, if I was shooting a Creedmoor. If I was the victim of something unfortunate like that, I would want to be shooting the bigger cartridge with more downrange energy and likely a bigger exit wound for more blood loss and a better blood trail.</p></blockquote><p></p>
[QUOTE="bobinpa, post: 3044263, member: 10991"] It has almost nothing to do with bullet diameter and almost everything to do with energy and hydrostatic shock. For example, according to any common ballistic calculator: A .264 dia. 140 grain Nosler Partition with a realistic muzzle velocity of 2900 FPS has 1268 Ft Lbs of energy at 500 yards (6.5 PRC) A .338 dia. 250 grain Nosler Partition with a realistic muzzle velocity of 2900 FPS has 2200 Ft Lbs of energy at 500 yards (338 RUM) A .264 dia. 140 grain Nosler Partition with a realistic muzzle velocity of 2600 FPS has 911 Ft Lbs of energy at 500 yards (6.5 Creedmoor) The difference in downrange energy is so great that you have to add another gun, like a 6.5 Creedmoor for example, to get to the same amount of energy. 6.5 PRC + 6.5 Creedmoor = 338 RUM Furthermore with a mere 5 mph crosswind, based on the data above: The 6.5 PRC gets blown 9" The 338 RUM gets blown 9" The Creedmoor gets blown 12" This is enough to turn a heart shot into a lung shot and a lung shot into a liver or gut shot. I would not want to be the guy that had to make a 500 yard cross canyon shot and get blown off 9" - 12" by an undetectable 5 mph thermal draft, if I was shooting a Creedmoor. If I was the victim of something unfortunate like that, I would want to be shooting the bigger cartridge with more downrange energy and likely a bigger exit wound for more blood loss and a better blood trail. [/QUOTE]
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