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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Experiment for quantifying lot to lot variations of powders
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<blockquote data-quote="Bart B" data-source="post: 684131" data-attributes="member: 5302"><p>Looks to me like you don't mind if there's errors in your velocity data. And inaccurate data's OK by you.</p><p></p><p>The vast majority of published data (spoken, printed or internet based) on velocity, accuracy and so many other things regarding the shooting sports includes all the human caused variables. No wonder there's dozens (hundreds?) of favorite load recipies. Especially those derived from shoulder fired rifles resting atop something on a bench. I"ve personally witnessed a 60 fps spread in the same rifle-ammo combination between me and a friend shooting the same rifle shoulder fired from a bench. Others have reported up to 100 fps. And nobody holds a rifle to shoot test groups for accuracy as repeatable as a machine rest (accuracy cradle) does. Totally free recoiling benchrest rifles are a very close second.</p><p></p><p>Velocity data is only 100% valid from fixed barrels. Anytime the barrel moves backwards as the bullet moves down the barrel, muzzle velocity will be less than if that barrel was fixed. Shame on you, Newton, for coming up with your third law of motion that so many people fail to obey.</p></blockquote><p></p>
[QUOTE="Bart B, post: 684131, member: 5302"] Looks to me like you don't mind if there's errors in your velocity data. And inaccurate data's OK by you. The vast majority of published data (spoken, printed or internet based) on velocity, accuracy and so many other things regarding the shooting sports includes all the human caused variables. No wonder there's dozens (hundreds?) of favorite load recipies. Especially those derived from shoulder fired rifles resting atop something on a bench. I"ve personally witnessed a 60 fps spread in the same rifle-ammo combination between me and a friend shooting the same rifle shoulder fired from a bench. Others have reported up to 100 fps. And nobody holds a rifle to shoot test groups for accuracy as repeatable as a machine rest (accuracy cradle) does. Totally free recoiling benchrest rifles are a very close second. Velocity data is only 100% valid from fixed barrels. Anytime the barrel moves backwards as the bullet moves down the barrel, muzzle velocity will be less than if that barrel was fixed. Shame on you, Newton, for coming up with your third law of motion that so many people fail to obey. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Experiment for quantifying lot to lot variations of powders
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