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408CT based calibers
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<blockquote data-quote="Fiftydriver" data-source="post: 257727" data-attributes="member: 10"><p>First time I saw the 350 gr. 375 cal SMK I was less then impressed. I though what a waste!!! Huge boattail, very little baring surface and really not much longer then a 300 gr SMK 338 cal bullet. I figured BC would be in the .6 range if it was lucky. </p><p> </p><p>I think I even posted my feelings about them when I first saw them. I then contacted my contact at Chey Tac Industries and asked them what their tests were showing for a BC for the new bullet. They told me roughly 0.770 in their tests with their 375 Chey Tac launched at 3000 fps.</p><p> </p><p>There was no way this bullet would make the same BC as Sierra listed for the 300 gr SMK 338 pill.</p><p> </p><p>Loaded some up and worked up a load that averaged 3295 fps in my 338 AM. Just because thats what they said, I used a BC of .770 in my drop chart and headed out to test it. To my great surpise, it was dead on the money out to 1500 yards which is the max I tested it to. From 500 to 1500 yards it was dead on.</p><p> </p><p>In my testing with my 338 AM, I find I have to use .800 for the 300 gr SMK to get drop to match up with the predicted computer numbers. So while its not the full equal to the 300 gr SMK in BC, its **** close and much better then I ever expected it would be.</p><p> </p><p>I have pushed for a long time to get a 375 gr BTHP match bullet and recommended that to Chey Tac but they said Sierra would not order in the longer dies needed to make the longer bullet.</p><p> </p><p>To be honest, I would be even happier with a 350 gr aluminum tipped bullet with a BC in the .9 range. Keep the speed, boost the BC, win-win, especially with the Sierra jacket that will take pretty much any velocity you can throw at it.</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 257727, member: 10"] First time I saw the 350 gr. 375 cal SMK I was less then impressed. I though what a waste!!! Huge boattail, very little baring surface and really not much longer then a 300 gr SMK 338 cal bullet. I figured BC would be in the .6 range if it was lucky. I think I even posted my feelings about them when I first saw them. I then contacted my contact at Chey Tac Industries and asked them what their tests were showing for a BC for the new bullet. They told me roughly 0.770 in their tests with their 375 Chey Tac launched at 3000 fps. There was no way this bullet would make the same BC as Sierra listed for the 300 gr SMK 338 pill. Loaded some up and worked up a load that averaged 3295 fps in my 338 AM. Just because thats what they said, I used a BC of .770 in my drop chart and headed out to test it. To my great surpise, it was dead on the money out to 1500 yards which is the max I tested it to. From 500 to 1500 yards it was dead on. In my testing with my 338 AM, I find I have to use .800 for the 300 gr SMK to get drop to match up with the predicted computer numbers. So while its not the full equal to the 300 gr SMK in BC, its **** close and much better then I ever expected it would be. I have pushed for a long time to get a 375 gr BTHP match bullet and recommended that to Chey Tac but they said Sierra would not order in the longer dies needed to make the longer bullet. To be honest, I would be even happier with a 350 gr aluminum tipped bullet with a BC in the .9 range. Keep the speed, boost the BC, win-win, especially with the Sierra jacket that will take pretty much any velocity you can throw at it. [/QUOTE]
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