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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
338 300gr BC
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<blockquote data-quote="Fiftydriver" data-source="post: 429740" data-attributes="member: 10"><p>Trebark,</p><p> </p><p>How do you figure that?</p><p> </p><p>Check it with one velocity and see if it matches up, if not check the 30 fps faster velocity.</p><p> </p><p>In most cases, 30 fps is not worth even worrying about, average the difference and use that velocity for your program. </p><p> </p><p>30 fps spread will not make 1 moa of difference at long range(1000 yards) Not even close.</p><p> </p><p>Here is an example of 30 fps variation at 1000 yards: My 338 AM with 300 gr SMK</p><p> </p><p>3300 fps velocity and data at 1000 yards:</p><p>Retained velocity: 2303 fps</p><p>Retained energy: 3532 ft/lbs</p><p>bullet drop w/ 100 yard zero: 16.75 moa (174.2")</p><p>bullet drift w/ 10 mph crosswind: 3.0 moa (31.8")</p><p> </p><p>3330 fps velocity and data at 1000 yards:</p><p>Retained velocity: 2327 fps (only 24 fps difference)</p><p>Retained energy: 3605 ft/lbs (73 ft/lbs difference)</p><p>bullet drop: 16.25 moa (1/2 moa difference)</p><p>bullet drift: 3.0 moa (no difference)</p><p> </p><p>Now if you can consistantly hold less then 1/2 moa accuracy you MAY be able to see the difference of 30 fps at 1000 yards with this class of chambering but I know very few that can hold this level of accuracy consistantly shooting from field conditions.</p><p> </p><p>A shooters ability to accurately judge shooting conditions will make MUCH more difference in the real world that 30 fps velocity spread.</p><p> </p><p>Maybe I misunderstood your comments.</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 429740, member: 10"] Trebark, How do you figure that? Check it with one velocity and see if it matches up, if not check the 30 fps faster velocity. In most cases, 30 fps is not worth even worrying about, average the difference and use that velocity for your program. 30 fps spread will not make 1 moa of difference at long range(1000 yards) Not even close. Here is an example of 30 fps variation at 1000 yards: My 338 AM with 300 gr SMK 3300 fps velocity and data at 1000 yards: Retained velocity: 2303 fps Retained energy: 3532 ft/lbs bullet drop w/ 100 yard zero: 16.75 moa (174.2") bullet drift w/ 10 mph crosswind: 3.0 moa (31.8") 3330 fps velocity and data at 1000 yards: Retained velocity: 2327 fps (only 24 fps difference) Retained energy: 3605 ft/lbs (73 ft/lbs difference) bullet drop: 16.25 moa (1/2 moa difference) bullet drift: 3.0 moa (no difference) Now if you can consistantly hold less then 1/2 moa accuracy you MAY be able to see the difference of 30 fps at 1000 yards with this class of chambering but I know very few that can hold this level of accuracy consistantly shooting from field conditions. A shooters ability to accurately judge shooting conditions will make MUCH more difference in the real world that 30 fps velocity spread. Maybe I misunderstood your comments. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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338 300gr BC
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