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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Max effective range of 168 Eld M in 308?
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<blockquote data-quote="Possum Cop" data-source="post: 1841102" data-attributes="member: 108622"><p>My experience with 3 different 20" barrels in .308 shooting 168 grain BTHP ammo. I shot hand loads in one of the rifles and factory Blackhills ammo in the other 2. </p><p></p><p>All 3 guns shot good groups out to 600 yards but started to open up around 700 but still were center of the target. 800 yards all rounds hit the target but sporadic and at 850 yards the bullets were going in the target sideways. I would assume that the rounds went transonic at 750 or so and subsonic at 8 to 850. This is not scientific, just my take on what I think was happening.</p><p></p><p>Severe instability can occur at transonic speeds. Transonic shock waves can cause increased drag and add asymmetry and unsteadiness to the air flow around the bullet which will cause the bullet to wobble and become unstable.</p><p></p><p>My 26" barrels didn't have these issues they grouped tight and hit the center of the 1000 yard F-Class rifle targets. I was shooting 175 grain hand loads in these 2 rifles. </p><p></p><p>Just my 2 cents. </p><p>Best of luck!</p></blockquote><p></p>
[QUOTE="Possum Cop, post: 1841102, member: 108622"] My experience with 3 different 20” barrels in .308 shooting 168 grain BTHP ammo. I shot hand loads in one of the rifles and factory Blackhills ammo in the other 2. All 3 guns shot good groups out to 600 yards but started to open up around 700 but still were center of the target. 800 yards all rounds hit the target but sporadic and at 850 yards the bullets were going in the target sideways. I would assume that the rounds went transonic at 750 or so and subsonic at 8 to 850. This is not scientific, just my take on what I think was happening. Severe instability can occur at transonic speeds. Transonic shock waves can cause increased drag and add asymmetry and unsteadiness to the air flow around the bullet which will cause the bullet to wobble and become unstable. My 26” barrels didn’t have these issues they grouped tight and hit the center of the 1000 yard F-Class rifle targets. I was shooting 175 grain hand loads in these 2 rifles. Just my 2 cents. Best of luck! [/QUOTE]
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Max effective range of 168 Eld M in 308?
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