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Long Range Hunting & Shooting
6.5 smk recovered
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<blockquote data-quote="Fiftydriver" data-source="post: 331319" data-attributes="member: 10"><p>I think the point I was trying to make was lost somehow. Let me put it another way.</p><p> </p><p>If you take a 338 cal 300 gr SMK and cross section that bullet and then take a 140 gr 6.5mm SMK and cross section it, the percentage of that cross sectional area that is made up of jacket material will be MUCH higher for the 6.5mm bullet compared to the 338 cal bullet.</p><p> </p><p>The amount of lead in the cross section will be much higher for the 338 cal bullet. Lead deforms on impact MUCH easier then jacket material.</p><p> </p><p>Another thing to consider is kenetic energy. I know, I know, this is not a good idicator or killing power, BUT, what makes a bullet deform on impact? Energy in the bullet(kenetic energy) and resistance in the target at impact. If you try to drive a needle through a watermellon it goes through the skin very easily with very little resistance at all. If you try to drive a pencil through the same watermellon, it goes in easy but there is much more resistance. The larger the diameter the object being forced through another object, the more resistance will be encounted.</p><p> </p><p>Now, because the 338 bullet is carrying MUCH more kenetic energy and will have much more resistance on impact, its is a fact that the 338 SMK bullet WILL expand easier and more reliably on target then the smaller caliber bullets. I have actually tested this time and again on all the SMK including the 80 gr 22 cal, 107 gr 6mm, 142 gr 6.5mm, 175 gr 7mm, 210, 220, 240 gr 30 cal and 300 gr 338 cal. </p><p> </p><p>If retained velocity was kept over 1500 fps with the 30 and 338 cal bullets, there was significant bullet expansion over nominal bullet diameter. At 1400 fps or so, there was enough tip deformation to cut a larger permanent wound channel. Below this there was not much of any expansion. Over 1800 fps there was pretty much full expansion with these bullets.</p><p> </p><p>With the smaller calibers, the 7mm needed around 200 fps more velocity for same expansion. The 6mm and 6.5mm SMK performed very similiarly as well and to get good expansion, I needed 1800 to 1900 fps retained velocity. Anything below this resulted in very little expansion.</p><p> </p><p>At 1000 yards, I also tested these bullets shooting into a soft wet sandy bank and it was interesting to see the results. Even starting out at much lower muzzle velocities or impacting with nearly identical velocities, the larger the SMK was in caliber, the more aggressive it expanded on impact.</p><p> </p><p>Again, I was in no way trying to flame anyone. Just stating some facts on bullet expansion testing I have done myself with this same bullet design. There are many that think the only reason alot of us use large caliber rifles for long range hunting is for sure ego as represented in reply posts already posted. For some yes, that is likely the reason for for those that are serious about long range hunting, ego has nothing to do with our decision to use these larger calibers. </p><p> </p><p>Again, not saying the smaller calibers go not work but the larger calibers will work better and will perform more reliably at long range and that can not be denied.</p><p> </p><p>That was my only point.</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 331319, member: 10"] I think the point I was trying to make was lost somehow. Let me put it another way. If you take a 338 cal 300 gr SMK and cross section that bullet and then take a 140 gr 6.5mm SMK and cross section it, the percentage of that cross sectional area that is made up of jacket material will be MUCH higher for the 6.5mm bullet compared to the 338 cal bullet. The amount of lead in the cross section will be much higher for the 338 cal bullet. Lead deforms on impact MUCH easier then jacket material. Another thing to consider is kenetic energy. I know, I know, this is not a good idicator or killing power, BUT, what makes a bullet deform on impact? Energy in the bullet(kenetic energy) and resistance in the target at impact. If you try to drive a needle through a watermellon it goes through the skin very easily with very little resistance at all. If you try to drive a pencil through the same watermellon, it goes in easy but there is much more resistance. The larger the diameter the object being forced through another object, the more resistance will be encounted. Now, because the 338 bullet is carrying MUCH more kenetic energy and will have much more resistance on impact, its is a fact that the 338 SMK bullet WILL expand easier and more reliably on target then the smaller caliber bullets. I have actually tested this time and again on all the SMK including the 80 gr 22 cal, 107 gr 6mm, 142 gr 6.5mm, 175 gr 7mm, 210, 220, 240 gr 30 cal and 300 gr 338 cal. If retained velocity was kept over 1500 fps with the 30 and 338 cal bullets, there was significant bullet expansion over nominal bullet diameter. At 1400 fps or so, there was enough tip deformation to cut a larger permanent wound channel. Below this there was not much of any expansion. Over 1800 fps there was pretty much full expansion with these bullets. With the smaller calibers, the 7mm needed around 200 fps more velocity for same expansion. The 6mm and 6.5mm SMK performed very similiarly as well and to get good expansion, I needed 1800 to 1900 fps retained velocity. Anything below this resulted in very little expansion. At 1000 yards, I also tested these bullets shooting into a soft wet sandy bank and it was interesting to see the results. Even starting out at much lower muzzle velocities or impacting with nearly identical velocities, the larger the SMK was in caliber, the more aggressive it expanded on impact. Again, I was in no way trying to flame anyone. Just stating some facts on bullet expansion testing I have done myself with this same bullet design. There are many that think the only reason alot of us use large caliber rifles for long range hunting is for sure ego as represented in reply posts already posted. For some yes, that is likely the reason for for those that are serious about long range hunting, ego has nothing to do with our decision to use these larger calibers. Again, not saying the smaller calibers go not work but the larger calibers will work better and will perform more reliably at long range and that can not be denied. That was my only point. [/QUOTE]
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6.5 smk recovered
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