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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Fast and slow barrels (or is it chambers)?
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<blockquote data-quote="Fiftydriver" data-source="post: 36496" data-attributes="member: 10"><p>Dave King,</p><p></p><p>I have seen some variation in the rifles I build similiar to the ones you are seeing.</p><p></p><p>In your case I would speculate that your custom Rem 700 with its shorter barrel and match chamber is creating more velocity for a couple reasons.</p><p></p><p>First off, I am sure the throat in the match chamber is much tighter and shorter then the NATO spec chamber. This will create significant velocity over the looser chamber.</p><p></p><p>Along with that though, the tighter twist on the rifling will also increase load pressure and will result in a bit more velocity on average then a slower twist.</p><p></p><p>This is only when using the same load, the slower barrel with a topped out load will produce more velocity then the slower twist with max load but in your comparison, the faster twist will get more speed.</p><p></p><p>Other factors I have seen with velocity variations from one barrel to another is the design of the rifling.</p><p></p><p>My preferred barrels to use are Lilja barrels. These are built to true BR tight bored specs and as such tend to not produce the extreme velocity that some other brands with looser bores will.</p><p></p><p>Still with the level of accuracy offered by these barrels, I prefer this over extreme velocity.</p><p></p><p>Also, different numbers of rifling lands will also effect accuracy. A 3 groove will shoot at a different speed then a 6 or 8 groove.</p><p></p><p>So while I personally feel the chamber is the largest contributor to velocity levels, there are several others that add up or subtract from velocity as well.</p><p></p><p>Just what I have been seeing in my rifles.</p><p></p><p>Good Shooting!!!</p><p></p><p>Kirby Allen(50)</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 36496, member: 10"] Dave King, I have seen some variation in the rifles I build similiar to the ones you are seeing. In your case I would speculate that your custom Rem 700 with its shorter barrel and match chamber is creating more velocity for a couple reasons. First off, I am sure the throat in the match chamber is much tighter and shorter then the NATO spec chamber. This will create significant velocity over the looser chamber. Along with that though, the tighter twist on the rifling will also increase load pressure and will result in a bit more velocity on average then a slower twist. This is only when using the same load, the slower barrel with a topped out load will produce more velocity then the slower twist with max load but in your comparison, the faster twist will get more speed. Other factors I have seen with velocity variations from one barrel to another is the design of the rifling. My preferred barrels to use are Lilja barrels. These are built to true BR tight bored specs and as such tend to not produce the extreme velocity that some other brands with looser bores will. Still with the level of accuracy offered by these barrels, I prefer this over extreme velocity. Also, different numbers of rifling lands will also effect accuracy. A 3 groove will shoot at a different speed then a 6 or 8 groove. So while I personally feel the chamber is the largest contributor to velocity levels, there are several others that add up or subtract from velocity as well. Just what I have been seeing in my rifles. Good Shooting!!! Kirby Allen(50) [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Fast and slow barrels (or is it chambers)?
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