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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Balllistics Program Question
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<blockquote data-quote="Blaine Fields" data-source="post: 24753" data-attributes="member: 183"><p>Dave,</p><p></p><p>I think you're right. From S1's post, I decided to look at bullet drop which is simply a function of time. For a 178 gr. in 308 at 2675 at the muzzle, total bullet drop for the 100 yd. trip was 2.55 inches. Elevating the temp and lowering the pressure significantly lowered the drop to 2.54 inches, an insignificant amount. So it would appear that once zeroed at 100 yds., any change of atmospherics would have no real effect on that zero.</p><p></p><p>Of course, if the initial zero was at 600 yds., a correction factor would be required and using bullet drop over time would seem to be the approach to computing this factor.</p><p></p><p>Thanks.</p></blockquote><p></p>
[QUOTE="Blaine Fields, post: 24753, member: 183"] Dave, I think you're right. From S1's post, I decided to look at bullet drop which is simply a function of time. For a 178 gr. in 308 at 2675 at the muzzle, total bullet drop for the 100 yd. trip was 2.55 inches. Elevating the temp and lowering the pressure significantly lowered the drop to 2.54 inches, an insignificant amount. So it would appear that once zeroed at 100 yds., any change of atmospherics would have no real effect on that zero. Of course, if the initial zero was at 600 yds., a correction factor would be required and using bullet drop over time would seem to be the approach to computing this factor. Thanks. [/QUOTE]
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Balllistics Program Question
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