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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Barrel length & speed
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<blockquote data-quote="Mikecr" data-source="post: 2061392" data-attributes="member: 1521"><p>There is more to choosing barrel length than muzzle velocity, as there are prices for everything.</p><p>There are powder nodes, and barrel nodes, which are different things -combining to result.</p><p>Barrel nodes favor shorter/stiff barrels.</p><p>Powder nodes favor barrels long enough to well burn the powder.</p><p>You might reach for best balance.</p><p></p><p>A 6.5x284 pushes heavy for cal bullets using a lot of slow burning powder. With a long barrel, let's say 30", a little variance in powder burn has barrel time to normalize. If the barrel is short, say 24", variances in powder burn will likely plague results. You're also producing way different muzzle pressures here, which can affect quality of bullet release.</p><p>That's not to suggest short barreled 6.5x284s won't be accurate, but I wonder how forgiving this would be.</p><p>How reliable will the cold bore single shot accuracy be?</p><p>Considering his, I would go at least 28", ~heavy palma contour.</p><p></p><p>For a 260AI capacity with 140gr bullets, 28" has been as perfect as QuickLoad predicts. </p><p>For a 6.5x47L with 130gr bullets, I would go 26" barrel.</p><p>'Perfect' for me is the fastest powder that fills the case, producing SAAMI max, with muzzle pressure <8kpsi.</p><p>This standard has led me nearly directly to best loads in 22, 24, and 26cal.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 2061392, member: 1521"] There is more to choosing barrel length than muzzle velocity, as there are prices for everything. There are powder nodes, and barrel nodes, which are different things -combining to result. Barrel nodes favor shorter/stiff barrels. Powder nodes favor barrels long enough to well burn the powder. You might reach for best balance. A 6.5x284 pushes heavy for cal bullets using a lot of slow burning powder. With a long barrel, let's say 30", a little variance in powder burn has barrel time to normalize. If the barrel is short, say 24", variances in powder burn will likely plague results. You're also producing way different muzzle pressures here, which can affect quality of bullet release. That's not to suggest short barreled 6.5x284s won't be accurate, but I wonder how forgiving this would be. How reliable will the cold bore single shot accuracy be? Considering his, I would go at least 28", ~heavy palma contour. For a 260AI capacity with 140gr bullets, 28" has been as perfect as QuickLoad predicts. For a 6.5x47L with 130gr bullets, I would go 26" barrel. 'Perfect' for me is the fastest powder that fills the case, producing SAAMI max, with muzzle pressure <8kpsi. This standard has led me nearly directly to best loads in 22, 24, and 26cal. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Barrel length & speed
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