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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
.264 Win. Mag. Twist
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<blockquote data-quote="codyadams" data-source="post: 1622015" data-attributes="member: 87243"><p>If you don't want the extra length, over 26" is not necessary at all. I am using Retumbo and shooting 147's at 3240 fps, and velocity was up to 3320 before pressure signs showed up in the form of a light ejector mark, but still no increase in bolt lift. So my 3240 load is relatively light. You don't need over 26" to get great performance. If you want to though, it will only help.</p><p></p><p>The biggest thing that would help a .264 wm is to have it throated properly. SAAMI spec has a ridiculously short throat, see the attached photos. Top ones are the 140 VLD and 147 eld-m properly seated. Bottom photo is the 147 eld-m seated .010" off the lands in a SAAMI spec chamber. [ATTACH=full]131608[/ATTACH] [ATTACH=full]131609[/ATTACH]</p></blockquote><p></p>
[QUOTE="codyadams, post: 1622015, member: 87243"] If you don't want the extra length, over 26" is not necessary at all. I am using Retumbo and shooting 147's at 3240 fps, and velocity was up to 3320 before pressure signs showed up in the form of a light ejector mark, but still no increase in bolt lift. So my 3240 load is relatively light. You don't need over 26" to get great performance. If you want to though, it will only help. The biggest thing that would help a .264 wm is to have it throated properly. SAAMI spec has a ridiculously short throat, see the attached photos. Top ones are the 140 VLD and 147 eld-m properly seated. Bottom photo is the 147 eld-m seated .010" off the lands in a SAAMI spec chamber. [ATTACH=full]131608[/ATTACH] [ATTACH=full]131609[/ATTACH] [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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.264 Win. Mag. Twist
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