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Rifles, Reloading, Optics, Equipment
Reloading
Disappointing 308 MV.......and......which powder in Lapua factory 308?
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<blockquote data-quote="Brown Dog" data-source="post: 66283" data-attributes="member: 1622"><p><strong>Derek, 308 Sako,</strong> </p><p></p><p> <strong>As suggested, went out to check the chrono's calibration today. Not going for statistical validity here, trying to get a feel for what's going on:</strong> </p><p></p><p> <strong>2 rounds of Lapua factory averaged 2689fps. Not bad for a claimed MV of 2690!! </strong> </p><p></p><p><a href="http://www.hunt101.com/?p=267081&amp;c=544&amp;z=1" target="_blank"><img src="http://www.hunt101.com/img/267081.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a></p><p></p><p> <strong>…….Chrono calibration confirmed.</strong> </p><p></p><p> <strong>This was the set-up, chrono 10ft from muzzle. It's a CED Millenium chrono:</strong> </p><p><a href="http://www.hunt101.com/?p=267107&amp;c=500&amp;z=1" target="_blank"><img src="http://www.hunt101.com/img/267107.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a></p><p></p><p> <strong>My pet load clocked 2722fps (the cases I used yesterday were 'spares' rather than my super-duper prepped cases): </strong> </p><p></p><p><a href="http://www.hunt101.com/?p=267096&amp;c=544&amp;z=1" target="_blank"><img src="http://www.hunt101.com/img/267096.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a></p><p></p><p> <strong>Despite confiming the 2722fps actual MV, the data input required to model the 'observed' trajectory is as follows: /ubbthreads/images/graemlins/confused.gif</strong> </p><p></p><p>MV (fps) 2580 </p><p>Bullet Wt (Gn) 165 </p><p>BC 0.475 </p><p>Start Range (m) 0m 0 Yds </p><p>Increment (m) 25m 27.34 Yds </p><p>Impact Ht (cm) 1cm 0.3937 in </p><p>Zero Range (m) 100m 109.36 Yds </p><p>Pressure (mbar) 1000 </p><p>Scope Ht. (cm) 4.9cm 1.91 in </p><p>MOA value @ 100 yds 1.047in </p><p>******. Coeff. rate 0.5 </p><p>Break Velocity (fps) 1300 </p><p>Ammo/Rifle Description AW: 165 BT, 45 gr V140, 56.7mm </p><p> </p><p>Laser Range: 101 Angle of Sight: 0 </p><p>Wind Speed: 15 Altitude (m): 115 Pressure (mbar) 1000</p><p>Wind Dn: 3 Temp: 11 </p><p></p><p> <strong>By the way, 46grs of v140 pushed it up to 2800fps. Reckon that'll be my Scotland load /ubbthreads/images/graemlins/smile.gif …but what MV will I input to model it??? </strong> /ubbthreads/images/graemlins/confused.gif /ubbthreads/images/graemlins/confused.gif!!: </p><p></p><p><a href="http://www.hunt101.com/?p=267099&amp;c=504&amp;z=1" target="_blank"><img src="http://www.hunt101.com/img/267099.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a></p></blockquote><p></p>
[QUOTE="Brown Dog, post: 66283, member: 1622"] [b]Derek, 308 Sako,[/b] [b]As suggested, went out to check the chrono’s calibration today. Not going for statistical validity here, trying to get a feel for what's going on:[/b] [b]2 rounds of Lapua factory averaged 2689fps. Not bad for a claimed MV of 2690!! [/b] [url="http://www.hunt101.com/?p=267081&c=544&z=1"][img]http://www.hunt101.com/img/267081.jpg[/img][/url] [b]…….Chrono calibration confirmed.[/b] [b]This was the set-up, chrono 10ft from muzzle. It's a CED Millenium chrono:[/b] [url="http://www.hunt101.com/?p=267107&c=500&z=1"][img]http://www.hunt101.com/img/267107.jpg[/img][/url] [b]My pet load clocked 2722fps (the cases I used yesterday were ‘spares’ rather than my super-duper prepped cases): [/b] [url="http://www.hunt101.com/?p=267096&c=544&z=1"][img]http://www.hunt101.com/img/267096.jpg[/img][/url] [b]Despite confiming the 2722fps actual MV, the data input required to model the ‘observed’ trajectory is as follows: [img]/ubbthreads/images/graemlins/confused.gif[/img][/b] MV (fps) 2580 Bullet Wt (Gn) 165 BC 0.475 Start Range (m) 0m 0 Yds Increment (m) 25m 27.34 Yds Impact Ht (cm) 1cm 0.3937 in Zero Range (m) 100m 109.36 Yds Pressure (mbar) 1000 Scope Ht. (cm) 4.9cm 1.91 in MOA value @ 100 yds 1.047in ******. Coeff. rate 0.5 Break Velocity (fps) 1300 Ammo/Rifle Description AW: 165 BT, 45 gr V140, 56.7mm Laser Range: 101 Angle of Sight: 0 Wind Speed: 15 Altitude (m): 115 Pressure (mbar) 1000 Wind Dn: 3 Temp: 11 [b]By the way, 46grs of v140 pushed it up to 2800fps. Reckon that’ll be my Scotland load [img]/ubbthreads/images/graemlins/smile.gif[/img] …but what MV will I input to model it??? [/b] [img]/ubbthreads/images/graemlins/confused.gif[/img] [img]/ubbthreads/images/graemlins/confused.gif[/img]!!: [url="http://www.hunt101.com/?p=267099&c=504&z=1"][img]http://www.hunt101.com/img/267099.jpg[/img][/url] [/QUOTE]
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Disappointing 308 MV.......and......which powder in Lapua factory 308?
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