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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
New .338 lanches a 300gr Sierra MK at 3500fps?
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<blockquote data-quote="Fiftydriver" data-source="post: 883843" data-attributes="member: 10"><p>A lot of what your seeing is likely a result of that Jamison brass. The reason is because my reamers are speced around the old TTI brass which has slightly thinner necks then the Jamison brass. It works but its a snug fit. This results in some slight pressure increases as brass life increases. Very common from what I am seeing as brass ages.</p><p> </p><p> I would recommend use up this brass and then switch to some new Bertram 408 CT brass formed into the 375 AM. This brass is pretty much identical to the original TTI brass and is a bit stronger then the Jamison brass. Generally offering 50-75 fps more velocity with same brass life or same performance with even longer brass life. Plus, with the better neck to chamber fit, we see a less finicky combination overall.</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 883843, member: 10"] A lot of what your seeing is likely a result of that Jamison brass. The reason is because my reamers are speced around the old TTI brass which has slightly thinner necks then the Jamison brass. It works but its a snug fit. This results in some slight pressure increases as brass life increases. Very common from what I am seeing as brass ages. I would recommend use up this brass and then switch to some new Bertram 408 CT brass formed into the 375 AM. This brass is pretty much identical to the original TTI brass and is a bit stronger then the Jamison brass. Generally offering 50-75 fps more velocity with same brass life or same performance with even longer brass life. Plus, with the better neck to chamber fit, we see a less finicky combination overall. [/QUOTE]
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New .338 lanches a 300gr Sierra MK at 3500fps?
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