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Rifles, Reloading, Optics, Equipment
Reloading
Using chronograph data to determine the best load????
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<blockquote data-quote="Bart B" data-source="post: 92996" data-attributes="member: 5302"><p>On the same day with the same rifle and ammo, I got lower muzzle velocities shooting offhand, medium shooting sitting and highest shooting prone. Averages were only 10 to 15 fps apart, but the chrono showed that.</p><p></p><p>I've got as much as 50 fps spread from a 13-pound .308 Win. shooting 168 grain pills off a bench; alternating between one held loose barely touching my shoulder and then pulled hard into my shoulder.</p><p></p><p>A couple of friends shot the same rifle off sandbags atop a bench back in the '70s and got 102 fps average muzzle velocity difference between them. When they clamped the rifle in an 80-pound machine rest, the rifle shot the same ammo a bit faster and the muzzle velocity spread was the lowest of all due to very repeatable resistance to the rifle's recoil.</p><p></p><p>Us humans are just not as repeatable as we think we are. Don't forget that if the energy from the powder's not pushing the rifle backwards, all that energy pushes the bullet out the barrel. More backwards rifle movement means less forward bullet movement. Grade school physics.</p></blockquote><p></p>
[QUOTE="Bart B, post: 92996, member: 5302"] On the same day with the same rifle and ammo, I got lower muzzle velocities shooting offhand, medium shooting sitting and highest shooting prone. Averages were only 10 to 15 fps apart, but the chrono showed that. I've got as much as 50 fps spread from a 13-pound .308 Win. shooting 168 grain pills off a bench; alternating between one held loose barely touching my shoulder and then pulled hard into my shoulder. A couple of friends shot the same rifle off sandbags atop a bench back in the '70s and got 102 fps average muzzle velocity difference between them. When they clamped the rifle in an 80-pound machine rest, the rifle shot the same ammo a bit faster and the muzzle velocity spread was the lowest of all due to very repeatable resistance to the rifle's recoil. Us humans are just not as repeatable as we think we are. Don't forget that if the energy from the powder's not pushing the rifle backwards, all that energy pushes the bullet out the barrel. More backwards rifle movement means less forward bullet movement. Grade school physics. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Using chronograph data to determine the best load????
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