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Rifles, Reloading, Optics, Equipment
Reloading
Working up a load ... getting conflicting data?
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<blockquote data-quote="Mikecr" data-source="post: 1992753" data-attributes="member: 1521"><p>Barrel length in itself does not affect pressure peak (which is within an inch or so of bullet travel). But muzzle pressures rise if your powder isn't yet burned before reaching it, and because the pressure curve has not <u>fallen</u> as much with a shorter barrel.</p><p>Velocity comes with TIME of X-pressure push. That is, through acceleration, which is time dependent.</p><p>If you had a 55Kpsi pressure peak with only 3" of barrel beyond it, then the bullet will only accelerate for that 3" and reach maybe ~1/3 of the velocity it could reach with 30" of push. </p><p>With the 30" barrel length, the 'pressure' seen by 3" would be the same, and the pressure by muzzle would be way less (~8Kpsi).</p></blockquote><p></p>
[QUOTE="Mikecr, post: 1992753, member: 1521"] Barrel length in itself does not affect pressure peak (which is within an inch or so of bullet travel). But muzzle pressures rise if your powder isn't yet burned before reaching it, and because the pressure curve has not [U]fallen[/U] as much with a shorter barrel. Velocity comes with TIME of X-pressure push. That is, through acceleration, which is time dependent. If you had a 55Kpsi pressure peak with only 3" of barrel beyond it, then the bullet will only accelerate for that 3" and reach maybe ~1/3 of the velocity it could reach with 30" of push. With the 30" barrel length, the 'pressure' seen by 3" would be the same, and the pressure by muzzle would be way less (~8Kpsi). [/QUOTE]
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Reloading
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