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Rifles, Reloading, Optics, Equipment
Reloading
Double digit ES
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<blockquote data-quote="Bart B" data-source="post: 675733" data-attributes="member: 5302"><p>2 digit extreme spreads are not necessarily bad for accuracy. For example a Berger 7mm 168 gr Match Grade VLD Hunting bullet leaving at an average velocity of 2785 fps with a 30 fps spread will have vertical shot stringing at 1000 yards of about 6 to 7 inches if all the bullets leave at the same angle and are perfectly balanced and shaped. As bullets ain't all perfect, the shot stringing will be a couple inches more from the very small spread in BC.</p><p></p><p>Most barrels producing best accuracy have their bullets leaving just before the muzzle axis reaches its highest angle up from the barrel whipping when its fired. This lets those with faster muzzle velocity leave when the angle's a bit lower than slower ones that leave later. This is called positive compensation and typically masks vertical shot stringing at the longer ranges.</p><p></p><p>You might try some Wolff primers; a favorite of competitors. Magnum primers oft times do not produce best accuracy with belted cases. My 30 caliber mag's shot more accurate with milder primers than hot ones. And when all else is equal, different lots of primers will produce different levels of accuracy.</p><p></p><p>Ask someone else to shoot your bullets through a chronograph's screens. If their spread's lower than what you get, you're not holding the rifle against your body with the same pressure for each shot. I've been a victim of that problem. It can easily cause a 20 to 40 fps spread in muzzle velocity.</p></blockquote><p></p>
[QUOTE="Bart B, post: 675733, member: 5302"] 2 digit extreme spreads are not necessarily bad for accuracy. For example a Berger 7mm 168 gr Match Grade VLD Hunting bullet leaving at an average velocity of 2785 fps with a 30 fps spread will have vertical shot stringing at 1000 yards of about 6 to 7 inches if all the bullets leave at the same angle and are perfectly balanced and shaped. As bullets ain't all perfect, the shot stringing will be a couple inches more from the very small spread in BC. Most barrels producing best accuracy have their bullets leaving just before the muzzle axis reaches its highest angle up from the barrel whipping when its fired. This lets those with faster muzzle velocity leave when the angle's a bit lower than slower ones that leave later. This is called positive compensation and typically masks vertical shot stringing at the longer ranges. You might try some Wolff primers; a favorite of competitors. Magnum primers oft times do not produce best accuracy with belted cases. My 30 caliber mag's shot more accurate with milder primers than hot ones. And when all else is equal, different lots of primers will produce different levels of accuracy. Ask someone else to shoot your bullets through a chronograph's screens. If their spread's lower than what you get, you're not holding the rifle against your body with the same pressure for each shot. I've been a victim of that problem. It can easily cause a 20 to 40 fps spread in muzzle velocity. [/QUOTE]
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Double digit ES
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