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Hunting
Long Range Hunting & Shooting
155 or 175 for 308 Winchester?
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<blockquote data-quote="MMERSS" data-source="post: 941523" data-attributes="member: 63748"><p>I would say it depends. I've shot 1000 yards plus with everything from a 155 to 200 gr bullet during 308 load development. There were three main considerations that drove whether I ended up in the heavy end, light end, or in the middle; twist, base to ogive length, and precision velocity node.</p><p></p><p>Twist: straight forward, will it or will it not stabilize a bullet. If not, out of consideration.</p><p></p><p>Base to Ogive length: Important for those long bullets in a short throat. What is my OAL to lands? I prefer and look toward the heavies first. Will a short OAL to lands cause too much of a compressed load with the heavies for the velocity I'm looking to obtain?</p><p></p><p>Velocity node: Where is my velocity node for each weight bullet? Some gun/bullet combinations perform better at or near max pressure, some less.</p><p></p><p>Sometimes the lighter bullet with a very high velocity produces less wind drift at long range than a heavier bullet with a slower velocity (usually the case with a short throat).</p><p></p><p>It depends! I've experienced success with weights from 155-200 and all between. If you are shooting a SAAMI chamber don't overlook those lighter bullets in the 155 to 168 gr weight, especially the high BC ones like the Hybrids mentioned.</p></blockquote><p></p>
[QUOTE="MMERSS, post: 941523, member: 63748"] I would say it depends. I've shot 1000 yards plus with everything from a 155 to 200 gr bullet during 308 load development. There were three main considerations that drove whether I ended up in the heavy end, light end, or in the middle; twist, base to ogive length, and precision velocity node. Twist: straight forward, will it or will it not stabilize a bullet. If not, out of consideration. Base to Ogive length: Important for those long bullets in a short throat. What is my OAL to lands? I prefer and look toward the heavies first. Will a short OAL to lands cause too much of a compressed load with the heavies for the velocity I'm looking to obtain? Velocity node: Where is my velocity node for each weight bullet? Some gun/bullet combinations perform better at or near max pressure, some less. Sometimes the lighter bullet with a very high velocity produces less wind drift at long range than a heavier bullet with a slower velocity (usually the case with a short throat). It depends! I've experienced success with weights from 155-200 and all between. If you are shooting a SAAMI chamber don't overlook those lighter bullets in the 155 to 168 gr weight, especially the high BC ones like the Hybrids mentioned. [/QUOTE]
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155 or 175 for 308 Winchester?
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