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Rifles, Reloading, Optics, Equipment
Reloading
Pressure signs/chronographing
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<blockquote data-quote=".280Rem" data-source="post: 206028" data-attributes="member: 11140"><p>You really should use your chronograph to <strong>indicate</strong> pressures, because it does if you read it and your data correctly. </p><p> </p><p>The fast/slow barrel thing is true in a sense. But it's, in a way, been largely debunked as you seem to understand it. If you shoot the same load in 2 "identical" (ie two Remington M700s 30-06 with 24" bbls) and one gives higher velocity than the other with the same load, it's also giving higher pressure. There are no free lunches with velocity and pressure. A particular barrel may give higher velocities at the same powder charges you loaded for other rifles, but rest assured, the pressure is higher too. So, in reality, there is no fast/slow barrel, only different barrels. This is also the reason you hear many people proclaim that "X's data is optimistic, you can't get that velocity at that powder charge." In one sense they may be correct in that you can't get their velocity with their powder charge in your gun, but you can safely get near the same velocity at near the same pressure in the same legnth bbl, but you'll have to use more powder to do it. Most likely if they're producing data, they have test bbl's cut to very exacting SAAMI standards...tight tolerances. They're going to get higher velocity at lower powder charges...due to higher pressure at a given powder charge because of the tighter tolerances than your or my mass produced M70, M700, Sako, Browning or whatever.</p></blockquote><p></p>
[QUOTE=".280Rem, post: 206028, member: 11140"] You really should use your chronograph to [B]indicate[/B] pressures, because it does if you read it and your data correctly. The fast/slow barrel thing is true in a sense. But it's, in a way, been largely debunked as you seem to understand it. If you shoot the same load in 2 "identical" (ie two Remington M700s 30-06 with 24" bbls) and one gives higher velocity than the other with the same load, it's also giving higher pressure. There are no free lunches with velocity and pressure. A particular barrel may give higher velocities at the same powder charges you loaded for other rifles, but rest assured, the pressure is higher too. So, in reality, there is no fast/slow barrel, only different barrels. This is also the reason you hear many people proclaim that "X's data is optimistic, you can't get that velocity at that powder charge." In one sense they may be correct in that you can't get their velocity with their powder charge in your gun, but you can safely get near the same velocity at near the same pressure in the same legnth bbl, but you'll have to use more powder to do it. Most likely if they're producing data, they have test bbl's cut to very exacting SAAMI standards...tight tolerances. They're going to get higher velocity at lower powder charges...due to higher pressure at a given powder charge because of the tighter tolerances than your or my mass produced M70, M700, Sako, Browning or whatever. [/QUOTE]
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