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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Case Capacity Verses Barrel Lenght?
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<blockquote data-quote="NZVarminter" data-source="post: 104518" data-attributes="member: 5028"><p>I'm just wondering just how much effect barrel length has on velocity for a given capacity.</p><p></p><p>I know the general rule is 30-40fps per inch, but I dont think its that simple.</p><p></p><p>I've got a 243 that was 22" and I cut it back to 19". At 22' my hunting load was 100g bullet at 2850 fps. When I cut it down to 19" that same load went 2750 so I lost 100fps.</p><p></p><p>But I've since re-worked my loads and am now getting 3000fps out of the 19" barrel which is what most handbooks list for a 24" bbl.</p><p></p><p>I'm now thinking of rebarreling to 7mm08/284 or perhaps 7mmWSM but again I want to go with a 19" barrel.</p><p></p><p>What I'm not sure of is whether the larger capacity cases (284/wsm) will have a more significant velocity loss as they need the extra barrel length to acheive full combustion????</p><p></p><p>I see most of you guys that are serious "long Range" shooter are using 28-30" bbls. Is there really that much to gain from the extra 6" over a 22"?</p><p></p><p>Cheers</p><p></p><p>Grant</p><p></p><p>e.g</p></blockquote><p></p>
[QUOTE="NZVarminter, post: 104518, member: 5028"] I'm just wondering just how much effect barrel length has on velocity for a given capacity. I know the general rule is 30-40fps per inch, but I dont think its that simple. I've got a 243 that was 22" and I cut it back to 19". At 22' my hunting load was 100g bullet at 2850 fps. When I cut it down to 19" that same load went 2750 so I lost 100fps. But I've since re-worked my loads and am now getting 3000fps out of the 19" barrel which is what most handbooks list for a 24" bbl. I'm now thinking of rebarreling to 7mm08/284 or perhaps 7mmWSM but again I want to go with a 19" barrel. What I'm not sure of is whether the larger capacity cases (284/wsm) will have a more significant velocity loss as they need the extra barrel length to acheive full combustion???? I see most of you guys that are serious "long Range" shooter are using 28-30" bbls. Is there really that much to gain from the extra 6" over a 22"? Cheers Grant e.g [/QUOTE]
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Case Capacity Verses Barrel Lenght?
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