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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
.338 Win Mag 250 or 300 SMK
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<blockquote data-quote="AZShooter" data-source="post: 345189" data-attributes="member: 5219"><p>Benchracer:</p><p></p><p>You mentioned you don't have a reloading program. Did you mean a ballistics program for calculating downrange performance? If you don't have one you can get a great one free:</p><p></p><p></p><p><a href="http://www.jbmballistics.com/" target="_blank">JBM</a></p><p></p><p>Here are a few steps to help you </p><p></p><p>Click on Calculations upper left</p><p>next click on trajectories</p><p>Enter data on your bullet. </p><p></p><p>Be sure to modify the atmospheric pressure. Bryan Litz says in his book that it is critical. Here are a few:</p><p> 2500 27.32</p><p>3000 26.82</p><p>4000 25.84</p><p>5000 24.90</p><p>8000 22.23</p><p></p><p>You may notice the G1 box. If you open it you can find the G7 option. Bryan says that G7 is a better one for boattail bullets. </p><p></p><p>Here is the G7 BC for the 250 and 300 SMKs:</p><p>250 smk .314</p><p>300 smk .381</p><p></p><p>Buy Bryan Litz's book "Applied Ballistics for Long Range Shooting. Lots of good information there. </p><p></p><p>-----------------------</p><p></p><p>Until recently the idea of owning another 338 win mag hasn't appealed to me, but it sure does now. Not sure if you realize it but Berger is coming out with two high BC VLDs for in .338!</p><p></p><p>The BCs on these two is stunning. Predicted BC as follows:</p><p>250 VLD G1 BC . 762 or G7 .390 ( this beats the 300 SMK's BC!)</p><p>300 VLD G1 BC . 914 or G7 .468</p><p></p><p>The 250 VLD fired from a .338 would be interesting even though it wouldn't be moving much more than 2600-2700 fps from a 26" barrel. Crunch the numbers in that JBM. amazing numbers even for a slow moving bullet.</p></blockquote><p></p>
[QUOTE="AZShooter, post: 345189, member: 5219"] Benchracer: You mentioned you don't have a reloading program. Did you mean a ballistics program for calculating downrange performance? If you don't have one you can get a great one free: [url=http://www.jbmballistics.com/]JBM[/url] Here are a few steps to help you Click on Calculations upper left next click on trajectories Enter data on your bullet. Be sure to modify the atmospheric pressure. Bryan Litz says in his book that it is critical. Here are a few: 2500 27.32 3000 26.82 4000 25.84 5000 24.90 8000 22.23 You may notice the G1 box. If you open it you can find the G7 option. Bryan says that G7 is a better one for boattail bullets. Here is the G7 BC for the 250 and 300 SMKs: 250 smk .314 300 smk .381 Buy Bryan Litz's book "Applied Ballistics for Long Range Shooting. Lots of good information there. ----------------------- Until recently the idea of owning another 338 win mag hasn't appealed to me, but it sure does now. Not sure if you realize it but Berger is coming out with two high BC VLDs for in .338! The BCs on these two is stunning. Predicted BC as follows: 250 VLD G1 BC . 762 or G7 .390 ( this beats the 300 SMK's BC!) 300 VLD G1 BC . 914 or G7 .468 The 250 VLD fired from a .338 would be interesting even though it wouldn't be moving much more than 2600-2700 fps from a 26" barrel. Crunch the numbers in that JBM. amazing numbers even for a slow moving bullet. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
.338 Win Mag 250 or 300 SMK
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