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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Comments on HOT 7mm's
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<blockquote data-quote="Fiftydriver" data-source="post: 105228" data-attributes="member: 10"><p><strong>Re: Comments on HOT 7mm\'s</strong></p><p></p><p>Dave,</p><p></p><p>I will agree with you on several points and respectfully disagree with you on one. Lets cover the points we agree on first.</p><p></p><p>The 338 caliber will certainly offer a longer throat life then the large 7mm rounds such as my 7mm AM. THis is hardly debatable /ubbthreads/images/graemlins/grin.gif!</p><p></p><p>On averge, the 338 rounds are also easier to load for, less finicky if you will, we agree again.</p><p></p><p>Also, on heavy game, a 300 gr bullet will have more physical effect then the smaller diameter 7mm bullet, of course it will, just a bigger hole being drilled though the target, we agree again.</p><p></p><p>Now to the one point that I have to disagree with, a 200 gr ULD RBBT 7mm bullet will kick the HELL out of a 300 gr SMK ballistically when both are drive to the same muzzle velocity.</p><p></p><p>Doing BC testing with both bullets out to 1500 yards I have found the 300 gr SMK to have a BC right in the .810 range when launched at 3100 fps out of my 338 Kahn. This is out of a 34.5" barrel as well.</p><p></p><p>The 200 gr ULD RBBT will produce a BC of .910 to .920 at this same velocity.</p><p></p><p>Only real difference is that in the 338 Kahn in the long 34.5" barrel, this is a top load with the 300 gr bullet. In my 7mm AM, 3100 fps is really a puff load and only out of a 30" barrel. Top loads will get you 3300 fps but I much prefer loads in the 3200 fps range simply because they are less finicky with temp changes and seem a bit more consistant in accuracy potential as well.</p><p></p><p>So ballistically you can compare these two sets of numbers:</p><p></p><p>300 gr SMK....0.810 BC.....3100 fps</p><p>200 gr ULD....0.910 BC.....3250 fps</p><p></p><p>Now these numbers are both derived from actual bullet drop over 1500 yards. These are not pure scientific BC values but they were both figured using the same exact method over the same ranges over the same velocities and in the same conditions and elevation.</p><p></p><p>As far as on game performance, the 338 bullet offers a bit higher BC value, .375 compared to .355 but both are more then high enough for any penetration on game up to the size of elk for an shot into the vitals. For dee hunting they are both far exceeding what is needed for full penetration.</p><p></p><p>SO simply put, while I would agree with you on most points, I have to say that you are incorrect in your comment about the 300 gr SMK being ballistically superior to the 200 gr ULD RBBT 7mm bullet. Simply not the case.</p><p></p><p>Then we can get into the debate on recoil. Drive a 300 gr pill to 3000 fps and then drive a 200 gr pill to the same velocity and the recoil will be significantly less for the 7mm.</p><p></p><p>Again, I am agree with most of your comments but on most game at long range the difference between the two bullets will be very slight when a vital impact is scored. </p><p></p><p>For a dedicated long range elk rifle I would agree full well, the larger calibers will perform better but that is not to say there would be anything to complain about using the 200 gr ULD RBBT 7mm bullet either.</p><p></p><p>No flaming or fighting going on here or intended, just good discussions on an interesting topic. I love both the 7mm and 338 calibers and both are extremely deadly on game at any range to be honest. Just have to hit them right with either caliber!! /ubbthreads/images/graemlins/grin.gif</p><p></p><p>Kirby Allen(50)</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 105228, member: 10"] [b]Re: Comments on HOT 7mm\'s[/b] Dave, I will agree with you on several points and respectfully disagree with you on one. Lets cover the points we agree on first. The 338 caliber will certainly offer a longer throat life then the large 7mm rounds such as my 7mm AM. THis is hardly debatable [img]/ubbthreads/images/graemlins/grin.gif[/img]! On averge, the 338 rounds are also easier to load for, less finicky if you will, we agree again. Also, on heavy game, a 300 gr bullet will have more physical effect then the smaller diameter 7mm bullet, of course it will, just a bigger hole being drilled though the target, we agree again. Now to the one point that I have to disagree with, a 200 gr ULD RBBT 7mm bullet will kick the HELL out of a 300 gr SMK ballistically when both are drive to the same muzzle velocity. Doing BC testing with both bullets out to 1500 yards I have found the 300 gr SMK to have a BC right in the .810 range when launched at 3100 fps out of my 338 Kahn. This is out of a 34.5" barrel as well. The 200 gr ULD RBBT will produce a BC of .910 to .920 at this same velocity. Only real difference is that in the 338 Kahn in the long 34.5" barrel, this is a top load with the 300 gr bullet. In my 7mm AM, 3100 fps is really a puff load and only out of a 30" barrel. Top loads will get you 3300 fps but I much prefer loads in the 3200 fps range simply because they are less finicky with temp changes and seem a bit more consistant in accuracy potential as well. So ballistically you can compare these two sets of numbers: 300 gr SMK....0.810 BC.....3100 fps 200 gr ULD....0.910 BC.....3250 fps Now these numbers are both derived from actual bullet drop over 1500 yards. These are not pure scientific BC values but they were both figured using the same exact method over the same ranges over the same velocities and in the same conditions and elevation. As far as on game performance, the 338 bullet offers a bit higher BC value, .375 compared to .355 but both are more then high enough for any penetration on game up to the size of elk for an shot into the vitals. For dee hunting they are both far exceeding what is needed for full penetration. SO simply put, while I would agree with you on most points, I have to say that you are incorrect in your comment about the 300 gr SMK being ballistically superior to the 200 gr ULD RBBT 7mm bullet. Simply not the case. Then we can get into the debate on recoil. Drive a 300 gr pill to 3000 fps and then drive a 200 gr pill to the same velocity and the recoil will be significantly less for the 7mm. Again, I am agree with most of your comments but on most game at long range the difference between the two bullets will be very slight when a vital impact is scored. For a dedicated long range elk rifle I would agree full well, the larger calibers will perform better but that is not to say there would be anything to complain about using the 200 gr ULD RBBT 7mm bullet either. No flaming or fighting going on here or intended, just good discussions on an interesting topic. I love both the 7mm and 338 calibers and both are extremely deadly on game at any range to be honest. Just have to hit them right with either caliber!! [img]/ubbthreads/images/graemlins/grin.gif[/img] Kirby Allen(50) [/QUOTE]
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