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New arrival (almost) 338AM 4days and counting
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<blockquote data-quote="Fiftydriver" data-source="post: 217317" data-attributes="member: 10"><p>With TTI brass, my standard load was 147.0 gr H-50BMG under the 300 gr SMK which generated 3550 fps in my 40" 338 AM and 3455 fps in my 32" lightweight rifles. This was a high pressure load but case life was roughly 5 firings per case before case extraction started to get sticky on following firings and also primer pocket tightness started to get looser then I like.</p><p> </p><p>Since then, TTI has pretty much become a memory, you can not get it, so we had to go a different direction to get brass to keep these rifles up and running. Enter Jamison International.</p><p> </p><p>Their original 408 CT brass at that time was not good at all. In fact very mild loads would loosen primer pockets on the first firing, at times to the point the primers would fall out of the case on the first firing.</p><p> </p><p>To their credit, they totally revamped their 408 CT case design by listening to those of us using the case for not only the 408 but also the wildcats based on it. THey thickened the case head web, thickened the case walls, thinned the case neck, used better case neck and shoulder annealing and then played with the grain structure they used in the brass alloy.</p><p> </p><p>In the end product, this greatly improved the performance of their brass. </p><p> </p><p>The last area that needed improvement was the primer pocket dimension. THey did finally tighten the specs up on the primer pocket.</p><p> </p><p>I wanted the primer pockets tighter yet to help offer even longer primer pocket life and again to their credit, they agreed to custom make me my 338 and 375 AM brass with tighter spec primer pockets which brings us to the latest brass I am using how.</p><p> </p><p>Performance wise, it WILL NOT match the levels of the TTI brass. That is just a simple fact. It will however allow you to drive the 300 gr SMK to 3300 fps out of a 32" barrel with case life in the 5 firings per case at least range. I personally generally load to 3250-3275 fps in my personal rifles simply to increase case life even more and down range performance is unchanged for all practical purposes.</p><p> </p><p>We have played with some exotic cases that may allow us to get back to the levels of the original TTI brass and then some but that is only in the R&D stages at this time.</p><p> </p><p>For the time being, I recommend loading to 3250-3300 fps with the Jamison cases which are the only easily attainable cases on the market at this time.</p><p> </p><p>In a 32" barrel length, please realize that 3300 fps is roughly 300 fps faster then the next largest 338 magnum out there which would be the 338-378 Wby, 338 Kahn class rounds. Quite a jump in performance.</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 217317, member: 10"] With TTI brass, my standard load was 147.0 gr H-50BMG under the 300 gr SMK which generated 3550 fps in my 40" 338 AM and 3455 fps in my 32" lightweight rifles. This was a high pressure load but case life was roughly 5 firings per case before case extraction started to get sticky on following firings and also primer pocket tightness started to get looser then I like. Since then, TTI has pretty much become a memory, you can not get it, so we had to go a different direction to get brass to keep these rifles up and running. Enter Jamison International. Their original 408 CT brass at that time was not good at all. In fact very mild loads would loosen primer pockets on the first firing, at times to the point the primers would fall out of the case on the first firing. To their credit, they totally revamped their 408 CT case design by listening to those of us using the case for not only the 408 but also the wildcats based on it. THey thickened the case head web, thickened the case walls, thinned the case neck, used better case neck and shoulder annealing and then played with the grain structure they used in the brass alloy. In the end product, this greatly improved the performance of their brass. The last area that needed improvement was the primer pocket dimension. THey did finally tighten the specs up on the primer pocket. I wanted the primer pockets tighter yet to help offer even longer primer pocket life and again to their credit, they agreed to custom make me my 338 and 375 AM brass with tighter spec primer pockets which brings us to the latest brass I am using how. Performance wise, it WILL NOT match the levels of the TTI brass. That is just a simple fact. It will however allow you to drive the 300 gr SMK to 3300 fps out of a 32" barrel with case life in the 5 firings per case at least range. I personally generally load to 3250-3275 fps in my personal rifles simply to increase case life even more and down range performance is unchanged for all practical purposes. We have played with some exotic cases that may allow us to get back to the levels of the original TTI brass and then some but that is only in the R&D stages at this time. For the time being, I recommend loading to 3250-3300 fps with the Jamison cases which are the only easily attainable cases on the market at this time. In a 32" barrel length, please realize that 3300 fps is roughly 300 fps faster then the next largest 338 magnum out there which would be the 338-378 Wby, 338 Kahn class rounds. Quite a jump in performance. [/QUOTE]
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