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Long Range Hunting & Shooting
Does Positive Compensation exist @ 600yrds?
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<blockquote data-quote="Doom2" data-source="post: 3088062" data-attributes="member: 108323"><p>FWIW, as to the original question, for a 308 169 SMK traveling at 2700 fps to have positive compensation for -20fps at 600 yds it would take a barrel deflection of~+0.00036" (assuming a 26" Barrel) to have the same impact point. This is based on a point of impact variance for the 20 fps of 0.3 MOA.</p><p></p><p>There is a paper where a group in China measured the deflection on a sniper rifle at +/-.99 mm. which is about 0.039". Based on that deflection it is plausible that positive compensation could be utilized but it would require detailed analysis of the first portion of the vibration with bullet travel time to determine whether it could be utilized.</p><p></p><p>[URL unfurl="true"]https://www.extrica.com/article/20370[/URL]</p><p></p><p>Testing and proving that positive compensation actually could be utilized would be difficult considering the amount of noise that would be present due to the number of variables involved. Triying to "tune" to a particular distance would be extremely difficult due to the number of rounds required to achieve repeatable results.</p><p></p><p> I saw a video where Scott Satterlee worked on seating depth at 100yds and used his Chronograph to pick a seating depth where his POI on with the slower round was above the faster rounds. Does it help? I don't know but the concept probably makes sense and has no apparent downside.</p></blockquote><p></p>
[QUOTE="Doom2, post: 3088062, member: 108323"] FWIW, as to the original question, for a 308 169 SMK traveling at 2700 fps to have positive compensation for -20fps at 600 yds it would take a barrel deflection of~+0.00036" (assuming a 26" Barrel) to have the same impact point. This is based on a point of impact variance for the 20 fps of 0.3 MOA. There is a paper where a group in China measured the deflection on a sniper rifle at +/-.99 mm. which is about 0.039". Based on that deflection it is plausible that positive compensation could be utilized but it would require detailed analysis of the first portion of the vibration with bullet travel time to determine whether it could be utilized. [URL unfurl="true"]https://www.extrica.com/article/20370[/URL] Testing and proving that positive compensation actually could be utilized would be difficult considering the amount of noise that would be present due to the number of variables involved. Triying to "tune" to a particular distance would be extremely difficult due to the number of rounds required to achieve repeatable results. I saw a video where Scott Satterlee worked on seating depth at 100yds and used his Chronograph to pick a seating depth where his POI on with the slower round was above the faster rounds. Does it help? I don't know but the concept probably makes sense and has no apparent downside. [/QUOTE]
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Does Positive Compensation exist @ 600yrds?
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