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Rifles, Reloading, Optics, Equipment
Reloading
Ladder testing at 1k- Detailed article and video
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<blockquote data-quote="Bart B" data-source="post: 1203302" data-attributes="member: 5302"><p>No, I would not tune anything on the load for different barrel profiles. Maybe for different chamber throats, but not much. Never saw much difference in how far the bullets have to jump to the lands. As long as the rounds are straight and minimal bullet runout, all's well in accuracy.</p><p></p><p>There is no industry standard for the various barrel profiles. Some Palma rifle barrels are as long, thick and stiff as benchrest barrels. Having shot the same load of 168's in .308 cases through 30" long skinny barrels as well as thick ones and seen no difference in accuracy, I'm convinced the bullets are leaving at the right place in the barrel's vertical whip upswing to compensate good for velocity spread.</p><p></p><p>One interesting thing to me in that link in post 1 on Long Range Load Development..... That benchrest rifle's fired in free recoil; untouched by humans except for a finger on its few-ounce trigger. It's barrel will whip differently while the bullets go through it compared to how it whips when held against ones shoulder as it rests on bags atop a bench. Bullets from free recoiling rifles will have a low average muzzle velocity and a low spread in muzzle velocity compared to hand held ones against the shooters shoulder resting on bags. I've seen as much as 50 fps across 3 people shooting the same .308 rifle and ammo so tested; others have seen almost 100 fps.</p></blockquote><p></p>
[QUOTE="Bart B, post: 1203302, member: 5302"] No, I would not tune anything on the load for different barrel profiles. Maybe for different chamber throats, but not much. Never saw much difference in how far the bullets have to jump to the lands. As long as the rounds are straight and minimal bullet runout, all's well in accuracy. There is no industry standard for the various barrel profiles. Some Palma rifle barrels are as long, thick and stiff as benchrest barrels. Having shot the same load of 168's in .308 cases through 30" long skinny barrels as well as thick ones and seen no difference in accuracy, I'm convinced the bullets are leaving at the right place in the barrel's vertical whip upswing to compensate good for velocity spread. One interesting thing to me in that link in post 1 on Long Range Load Development..... That benchrest rifle's fired in free recoil; untouched by humans except for a finger on its few-ounce trigger. It's barrel will whip differently while the bullets go through it compared to how it whips when held against ones shoulder as it rests on bags atop a bench. Bullets from free recoiling rifles will have a low average muzzle velocity and a low spread in muzzle velocity compared to hand held ones against the shooters shoulder resting on bags. I've seen as much as 50 fps across 3 people shooting the same .308 rifle and ammo so tested; others have seen almost 100 fps. [/QUOTE]
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Ladder testing at 1k- Detailed article and video
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