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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Barrle Length...
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<blockquote data-quote="Mikecr" data-source="post: 559519" data-attributes="member: 1521"><p>Well there is diminished returns pretty quickly. And more than just w/regard to velocity.</p><p>But even with extreme barrel lengths(like 100ft), muzzle pressures would continue to drop but velocities would continue to rise. There would still be barrel pressure(~50psi)(not vaccuum).</p><p></p><p>No point here would velocity actually drop, because the bullet was engraved way back, it lost a little jacket OD and obturates less with lowering pressures, and so it's frictional resistance would remain below barrel pressure forces.</p><p>Maybe this would change with a 150ft barrel (so don't go that long)!!</p></blockquote><p></p>
[QUOTE="Mikecr, post: 559519, member: 1521"] Well there is diminished returns pretty quickly. And more than just w/regard to velocity. But even with extreme barrel lengths(like 100ft), muzzle pressures would continue to drop but velocities would continue to rise. There would still be barrel pressure(~50psi)(not vaccuum). No point here would velocity actually drop, because the bullet was engraved way back, it lost a little jacket OD and obturates less with lowering pressures, and so it's frictional resistance would remain below barrel pressure forces. Maybe this would change with a 150ft barrel (so don't go that long)!! [/QUOTE]
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Barrle Length...
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