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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
preasure problems with 7 ultra
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<blockquote data-quote="Kiwi Nate" data-source="post: 356563" data-attributes="member: 8533"><p>I have now owned and reloaded for four 7mm Ultra's and I am pretty sure I know what your problem is- the powder charge is too light- way too light and your cartridge is suffering directional ignition/ secondary detonation or whatever the heck you want to call it. It the same problem as occurs with a light charge of W296 in the .44 magnum. </p><p> </p><p>You really need to be using a minimum 90 grains Retumbo to alleviate this problem, more if you are using a long COAL. Velocity should either drop or remain the same, strange as it sounds. You could switch to H50BMG but I find it burns the throat out in as little as 150 shots. Michael, who has been posting on this thread, is right on the money about throat life. The 7mm RUM (and STW) is problematic which is why there is a resurgence of interest in the 7mm-.300 Win mag wildcat and variations. </p><p> </p><p>Shoot your rifle, enjoy it while it lasts and be happy to see the back end of the 7mm RUM when its worn out.</p></blockquote><p></p>
[QUOTE="Kiwi Nate, post: 356563, member: 8533"] I have now owned and reloaded for four 7mm Ultra's and I am pretty sure I know what your problem is- the powder charge is too light- way too light and your cartridge is suffering directional ignition/ secondary detonation or whatever the heck you want to call it. It the same problem as occurs with a light charge of W296 in the .44 magnum. You really need to be using a minimum 90 grains Retumbo to alleviate this problem, more if you are using a long COAL. Velocity should either drop or remain the same, strange as it sounds. You could switch to H50BMG but I find it burns the throat out in as little as 150 shots. Michael, who has been posting on this thread, is right on the money about throat life. The 7mm RUM (and STW) is problematic which is why there is a resurgence of interest in the 7mm-.300 Win mag wildcat and variations. Shoot your rifle, enjoy it while it lasts and be happy to see the back end of the 7mm RUM when its worn out. [/QUOTE]
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preasure problems with 7 ultra
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