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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Twist Rate Required for 300gr MK Bulet
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<blockquote data-quote="cronhelm" data-source="post: 20935" data-attributes="member: 98"><p>I took a more in depth look at the ballistics involved and here are my thoughts.</p><p></p><p>The .338 Win mag, not being a HUGE case may not be the best vehicle for launching the big 300gr Sierra's. Lapua sells a 250gr bullet with a BC of .675. The lighter bullet will give me more case capacity as well as being easier to drive to faster velocities. This should translate into a loss of downrange energy but a gain in downrange velocity and a flatter trajectory. At 1900yds the 250gr bullet would still strike with more than 600 ft/lbs of energy.</p><p></p><p>The Lapua bullets also have an excellent reputation for accuracy.</p><p></p><p>Another conversation on this board brought up the fact that loads of deer are killed with .357 Mag revolvers which have a **** sight less impact energy than a 250gr .338 bullet.</p><p></p><p>The only downside to the Lapua bullets is they only come in boxes of 100 and they are a bit more expensive than the Sierra's. So if I decide to go this route I have at least 100 punishing shots to make out of an unbraked, lightweight .338 Win Mag. My shoulder hurts just thinking about it. <img src="http://images/icons/frown.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Peter Cronhelm</p></blockquote><p></p>
[QUOTE="cronhelm, post: 20935, member: 98"] I took a more in depth look at the ballistics involved and here are my thoughts. The .338 Win mag, not being a HUGE case may not be the best vehicle for launching the big 300gr Sierra's. Lapua sells a 250gr bullet with a BC of .675. The lighter bullet will give me more case capacity as well as being easier to drive to faster velocities. This should translate into a loss of downrange energy but a gain in downrange velocity and a flatter trajectory. At 1900yds the 250gr bullet would still strike with more than 600 ft/lbs of energy. The Lapua bullets also have an excellent reputation for accuracy. Another conversation on this board brought up the fact that loads of deer are killed with .357 Mag revolvers which have a **** sight less impact energy than a 250gr .338 bullet. The only downside to the Lapua bullets is they only come in boxes of 100 and they are a bit more expensive than the Sierra's. So if I decide to go this route I have at least 100 punishing shots to make out of an unbraked, lightweight .338 Win Mag. My shoulder hurts just thinking about it. [img]images/icons/frown.gif[/img] Peter Cronhelm [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Twist Rate Required for 300gr MK Bulet
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