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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Barrel Help
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<blockquote data-quote="sable tireur" data-source="post: 1235040" data-attributes="member: 27307"><p>MT257,</p><p></p><p>It is partially about the twist rate which is based on the longest bullet you think you might use or the industry standard, which for the .25 cal. is as stated 1:10". Your Nosler 115 gr. Partition will be stable using this 1:10" twist rate.</p><p></p><p>But the chamber, which is cut into the barrel, has some bearing on this also. That's why the others are pointing you towards your own reamer. You need to pay attention to the leade (freebore) and the length of the throat in order to accommodate the longest bullet of choice when loaded. The magazine length will also set the maximum OAL of the cartridge.</p><p></p><p>The reality is that if you're using standard .257 Weatherby loads with standard cup/core bullets, a SAAMI spec. reamer will certainly suffice. The traditional Weatherby leade will be longer than you need which is part of their pressure control so you can have the leade and the throat adjusted on a new reamer to your bullet if you so desire.</p><p></p><p>Regards.</p></blockquote><p></p>
[QUOTE="sable tireur, post: 1235040, member: 27307"] MT257, It is partially about the twist rate which is based on the longest bullet you think you might use or the industry standard, which for the .25 cal. is as stated 1:10". Your Nosler 115 gr. Partition will be stable using this 1:10" twist rate. But the chamber, which is cut into the barrel, has some bearing on this also. That's why the others are pointing you towards your own reamer. You need to pay attention to the leade (freebore) and the length of the throat in order to accommodate the longest bullet of choice when loaded. The magazine length will also set the maximum OAL of the cartridge. The reality is that if you're using standard .257 Weatherby loads with standard cup/core bullets, a SAAMI spec. reamer will certainly suffice. The traditional Weatherby leade will be longer than you need which is part of their pressure control so you can have the leade and the throat adjusted on a new reamer to your bullet if you so desire. Regards. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Barrel Help
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