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Rifles, Reloading, Optics, Equipment
Reloading
Need help with Hornady 178 ELD-M for 308.
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<blockquote data-quote="dstancu" data-source="post: 2880746" data-attributes="member: 9273"><p>From your numbers, it seems to be an ignition problem to start with.</p><p>I use Varget with good results in my Tikka T3x CTR on an Oryx chassis, MDT muzzle brake. Here is the solution that <em>works for me (only given as an example and reference, do not use it for your rifle, develop your own) </em>:</p><p>Bullet Hornady ELD-X 178gr</p><p>Varget 42.9gr (no pressure signs at all), Autotrickler with FX-120i scale</p><p>Primer Fed F210M</p><p>Federal (!) brass (annealed), Head Space 1.482</p><p>CBTO 2.120in (SAC comparator)</p><p>COAL 2.869in (to fit in my MDT mag, AICS type)</p><p></p><p>Results at 1 degree Celsius (34 F), 264m above sea level, atmospheric pressure 998 hPa, for 11 shots aggregated from 2 groups (one of 5, second of 4):</p><p>Av. Speed: 2562fps (Tikka barrels are a bit slow) LabRadar</p><p>SD: 7.5</p><p>ES: 20</p><p>On target, 0.8 MOA at 100meters for 11 shots</p><p>On other ocations, 5 shot groups are between 0.4-0.6 MOA</p><p>The Berger twist rate calculator gave me the result 1.4 for the least favorable conditions, on my 1:11 twist rate ("marginally stable", but pretty close to "stable", which starts at 1.5 and up). Indeed, I see nothing that resembles a keyhole even at longer ranges. For your 1:10 twist rate, it is certainly "stable".</p></blockquote><p></p>
[QUOTE="dstancu, post: 2880746, member: 9273"] From your numbers, it seems to be an ignition problem to start with. I use Varget with good results in my Tikka T3x CTR on an Oryx chassis, MDT muzzle brake. Here is the solution that [I]works for me (only given as an example and reference, do not use it for your rifle, develop your own) [/I]: Bullet Hornady ELD-X 178gr Varget 42.9gr (no pressure signs at all), Autotrickler with FX-120i scale Primer Fed F210M Federal (!) brass (annealed), Head Space 1.482 CBTO 2.120in (SAC comparator) COAL 2.869in (to fit in my MDT mag, AICS type) Results at 1 degree Celsius (34 F), 264m above sea level, atmospheric pressure 998 hPa, for 11 shots aggregated from 2 groups (one of 5, second of 4): Av. Speed: 2562fps (Tikka barrels are a bit slow) LabRadar SD: 7.5 ES: 20 On target, 0.8 MOA at 100meters for 11 shots On other ocations, 5 shot groups are between 0.4-0.6 MOA The Berger twist rate calculator gave me the result 1.4 for the least favorable conditions, on my 1:11 twist rate ("marginally stable", but pretty close to "stable", which starts at 1.5 and up). Indeed, I see nothing that resembles a keyhole even at longer ranges. For your 1:10 twist rate, it is certainly "stable". [/QUOTE]
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Need help with Hornady 178 ELD-M for 308.
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