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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Why are there fast bbls and slow bbls
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<blockquote data-quote="Bart B" data-source="post: 551163" data-attributes="member: 5302"><p>Having shot both button and cut rifled barrels with the same bore/groove and length dimensions, chambered with the same reamer, chronographing with the same lot of ammo showed only about 10 fps difference in velocity. That may have been caused by how I held the rifle for each setup.</p><p></p><p>Biggest difference I've seen has to do with the bore and groove diameters. The same lot of ammo with .3082" diameter bullets in a .308 Win. fired in barrels with bore/groove dimensions from .2970/.3065 up to .3020/.3090 showed a 240 fps spread in muzzle velocity.</p><p></p><p>More interesting is the velocity difference between two people shooting the same .308 Win. rifle/ammo from a bench. I've seen a 90 fps spread in average velocity between them. It had to be caused by how hard each held the rifle against their shoulder.</p></blockquote><p></p>
[QUOTE="Bart B, post: 551163, member: 5302"] Having shot both button and cut rifled barrels with the same bore/groove and length dimensions, chambered with the same reamer, chronographing with the same lot of ammo showed only about 10 fps difference in velocity. That may have been caused by how I held the rifle for each setup. Biggest difference I've seen has to do with the bore and groove diameters. The same lot of ammo with .3082" diameter bullets in a .308 Win. fired in barrels with bore/groove dimensions from .2970/.3065 up to .3020/.3090 showed a 240 fps spread in muzzle velocity. More interesting is the velocity difference between two people shooting the same .308 Win. rifle/ammo from a bench. I've seen a 90 fps spread in average velocity between them. It had to be caused by how hard each held the rifle against their shoulder. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Why are there fast bbls and slow bbls
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