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Hunting
The Basics, Starting Out
Hammer .284 177g Hammer Hunter twist rate
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<blockquote data-quote="Fiftydriver" data-source="post: 2699034" data-attributes="member: 10"><p>I helped with the initial testing of the 177 ge Hammer bullets many years back. Tested them in my 7mm Allen Magnum at some crazy velocities. Tested them in a 9 twist barrel first and they shot great accuracy wise even out to well past 1000 yards. Easily holding 1/2 moa accuracy potential at those ranges.</p><p></p><p>that said, we quickly found that bullet stability in flight is a much different beast then bullet stability after impact on big game. Harvested a very nice Canadian whitetail with the prototype bullets at a range of 120 yards, worked perfectly, straight penetration, broke both shoulders and exited, nice round exit hole.</p><p></p><p>later that same season took a nice Montana whitetail at around 650 yards. Bullet tumbled and veared off course after impact dramatically. Killed the buck but took a severe 60 degree turn after impact. Had similar results later that season on a whitetail doe at a bit over 700 yards.</p><p></p><p>we concluded that after impact, the retained length of the bullet resulted from a destabilization situation as it penetrated and as such would tumble. With the long length, the projo would often veer off course wildly. Fitted a new 8 twist barrel to my 7mm Allen Magnum test rifle. Top velocities were for the most part identical to the 9 twist. With the slight boost in RPMs and stability, we got nothing but straight penetration on big game with no degrade in accuracy.</p><p></p><p>in a lesser chambering, with much less velocity, a 7.5 may be the best but we found 8 twist to be great and if i were building one of my 7mm Allen Mags for a customer to use these bullets, it would have a bartlein 8 twist 5r barrel.</p><p></p><p>the twist recommendations offered by the boys at Hammer are often more focused on terminal performance and stability more then in flight stability.</p><p></p><p>your 8.5 may work. It will very likely be plenty for fine accuracy, just have to see how straight of penetration you get after impact on big game.</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 2699034, member: 10"] I helped with the initial testing of the 177 ge Hammer bullets many years back. Tested them in my 7mm Allen Magnum at some crazy velocities. Tested them in a 9 twist barrel first and they shot great accuracy wise even out to well past 1000 yards. Easily holding 1/2 moa accuracy potential at those ranges. that said, we quickly found that bullet stability in flight is a much different beast then bullet stability after impact on big game. Harvested a very nice Canadian whitetail with the prototype bullets at a range of 120 yards, worked perfectly, straight penetration, broke both shoulders and exited, nice round exit hole. later that same season took a nice Montana whitetail at around 650 yards. Bullet tumbled and veared off course after impact dramatically. Killed the buck but took a severe 60 degree turn after impact. Had similar results later that season on a whitetail doe at a bit over 700 yards. we concluded that after impact, the retained length of the bullet resulted from a destabilization situation as it penetrated and as such would tumble. With the long length, the projo would often veer off course wildly. Fitted a new 8 twist barrel to my 7mm Allen Magnum test rifle. Top velocities were for the most part identical to the 9 twist. With the slight boost in RPMs and stability, we got nothing but straight penetration on big game with no degrade in accuracy. in a lesser chambering, with much less velocity, a 7.5 may be the best but we found 8 twist to be great and if i were building one of my 7mm Allen Mags for a customer to use these bullets, it would have a bartlein 8 twist 5r barrel. the twist recommendations offered by the boys at Hammer are often more focused on terminal performance and stability more then in flight stability. your 8.5 may work. It will very likely be plenty for fine accuracy, just have to see how straight of penetration you get after impact on big game. [/QUOTE]
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The Basics, Starting Out
Hammer .284 177g Hammer Hunter twist rate
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