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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Twist Rate Required for 300gr MK Bulet
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<blockquote data-quote="Steve Shelp" data-source="post: 20930" data-attributes="member: 22"><p>Cronhelm,</p><p> Yes you've got a good safety margin with the 10" twist even with the lower velocities of the 338 Win Mag. A 11" will work and I know of 1 fella using a 12" but Dan Lilja has told me that a 12" won't work. According to my caluclations a 12" is right on the line of an not-so-exact science so I'll take the word of experience here.</p><p></p><p>every 338 used in BR competition that I know of right now including my own is using a 10" twist with the 300 Sierra's. All of my impacts are cutting very good holes without hardly any measureable yaw in the paper.</p><p></p><p>The only other thing I would add though is if your using a factory 338 Win Mag that is throated short for the standard weight 338 bullets is to watcch your pressurue signs. The 300gr bullet is long and will hog up a lot of boiler room capacity raising pressure very early.</p><p></p><p>Good luck though. I've heard that this combination works really well for accuracy.</p><p></p><p>Steve</p></blockquote><p></p>
[QUOTE="Steve Shelp, post: 20930, member: 22"] Cronhelm, Yes you've got a good safety margin with the 10" twist even with the lower velocities of the 338 Win Mag. A 11" will work and I know of 1 fella using a 12" but Dan Lilja has told me that a 12" won't work. According to my caluclations a 12" is right on the line of an not-so-exact science so I'll take the word of experience here. every 338 used in BR competition that I know of right now including my own is using a 10" twist with the 300 Sierra's. All of my impacts are cutting very good holes without hardly any measureable yaw in the paper. The only other thing I would add though is if your using a factory 338 Win Mag that is throated short for the standard weight 338 bullets is to watcch your pressurue signs. The 300gr bullet is long and will hog up a lot of boiler room capacity raising pressure very early. Good luck though. I've heard that this combination works really well for accuracy. Steve [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Twist Rate Required for 300gr MK Bulet
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