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Rifles, Bullets, Barrels & Ballistics
fastest 338 caliber?Build advice?
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<blockquote data-quote="Lightvarmint" data-source="post: 251897"><p>Kirby,</p><p></p><p>I must apologize that I did not state the standard conditions for the above numbers..... </p><p></p><p>BOTH sets of numbers were using the same altitude and atmospheric conditions..... Specifically, the altitude was 82 feet above sea level..... So if the BC for the 300 SMK gets adjusted for an altitude change, then the HAT BC should be adjusted for that same altitude change to keep the comparison consistent. Additionally, we ran the numbers using the 280 grain HAT model out of a 338 Lapua Improved casing and it was more significant in comparison than the 265 grain HAT out of the same case when compared to the Cheytac-based cases with the 300 SMK at 3400 fps......</p><p></p><p>You mention that you have faith in the 300 SMKs.... I do too.... I have a lot of them that have been sorted into the many different groups that one finds in large boxes of them... Specifically, we sort by weight, bearing surface, meplat consistency and then once that is done, we break them up into the four different heel geometries that we have seen. We have seen at least four distinct different heel configurations coming out of the same batch(s) of bullets.</p><p></p><p>And, we use them...... Specifically, we use them to practice with and to fireform cases with. They are a great practice bullet and a great fireforming bullet.</p><p></p><p>Just imagine the possibilities shooters have given that you are getting a solid 3400 fps with the 300 grain SMK and we get a 250 to 300 fps bump in velocity just by going from 300 grains to 265 grains in our guns..... </p><p></p><p>WOW, that equates to 3650 fps or even 3700 fps with the 265 grain HAT out of a Cheytac-based case..... Run the numbers at a sea level altitude with the 300 SMK at 3400 fps and the 265 grain HAT at 3700 fps and you will see the distinct advantage these bullets exhibit in the Cheytac-based cases. It is hard to ignore that comparison............</p><p></p><p>Our next mission/project is to see how close we can get to the performance figures in your post on 2-11-08 with us using a 300 RUM-based case. The reason we will use the 2-11-08 number is due to the large numbers of guns that were manufactured and sold based on this data..... We will be doing the comparison in both .30 and .338 calibers. Hopefully, we get closer than some might think....</p><p></p><p>Additioanlly, I would like to purchase one of your 338 Allen Magnum fire formed cases for my case collection since it has your name on the headstamp. Let me know how much it is and I will send you the funds for the shipping and the case. Thanks again.</p><p></p><p>Again, good luck in 2009.</p><p></p><p>Lightvarmint</p></blockquote><p></p>
[QUOTE="Lightvarmint, post: 251897"] Kirby, I must apologize that I did not state the standard conditions for the above numbers..... BOTH sets of numbers were using the same altitude and atmospheric conditions..... Specifically, the altitude was 82 feet above sea level..... So if the BC for the 300 SMK gets adjusted for an altitude change, then the HAT BC should be adjusted for that same altitude change to keep the comparison consistent. Additionally, we ran the numbers using the 280 grain HAT model out of a 338 Lapua Improved casing and it was more significant in comparison than the 265 grain HAT out of the same case when compared to the Cheytac-based cases with the 300 SMK at 3400 fps...... You mention that you have faith in the 300 SMKs.... I do too.... I have a lot of them that have been sorted into the many different groups that one finds in large boxes of them... Specifically, we sort by weight, bearing surface, meplat consistency and then once that is done, we break them up into the four different heel geometries that we have seen. We have seen at least four distinct different heel configurations coming out of the same batch(s) of bullets. And, we use them...... Specifically, we use them to practice with and to fireform cases with. They are a great practice bullet and a great fireforming bullet. Just imagine the possibilities shooters have given that you are getting a solid 3400 fps with the 300 grain SMK and we get a 250 to 300 fps bump in velocity just by going from 300 grains to 265 grains in our guns..... WOW, that equates to 3650 fps or even 3700 fps with the 265 grain HAT out of a Cheytac-based case..... Run the numbers at a sea level altitude with the 300 SMK at 3400 fps and the 265 grain HAT at 3700 fps and you will see the distinct advantage these bullets exhibit in the Cheytac-based cases. It is hard to ignore that comparison............ Our next mission/project is to see how close we can get to the performance figures in your post on 2-11-08 with us using a 300 RUM-based case. The reason we will use the 2-11-08 number is due to the large numbers of guns that were manufactured and sold based on this data..... We will be doing the comparison in both .30 and .338 calibers. Hopefully, we get closer than some might think.... Additioanlly, I would like to purchase one of your 338 Allen Magnum fire formed cases for my case collection since it has your name on the headstamp. Let me know how much it is and I will send you the funds for the shipping and the case. Thanks again. Again, good luck in 2009. Lightvarmint [/QUOTE]
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