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The Range
Ammo & Reloading
308 round
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<blockquote data-quote="MoBoost" data-source="post: 2088609" data-attributes="member: 3455"><p>Bullet jump is meaningless unless you have a custom chamber.</p><p></p><p>You seem to be on the "bullet jump" crusade. Bullet jump is at the bottom, and I mean very very bottom of the accuracy ladder. In your testing you might have ran into "A-HA!" moment - but it has to do more with pressure/velocity/harmonics that you would've seen in your OCW test. </p><p></p><p>For me it's a simple idea of statistics - once the mechanics are sorted out (type of bullet that works with particular twist and type of rifling) harmonics plays such an astonishingly HUGE role in the accuracy - it just has to be the only thing that matters for all practical purposes. </p><p></p><p>I use different approach to different type of shooting. </p><p>- A lot of times the COL is dictated by mag length - like hunting and high-power.</p><p>- Reduced loads need a lot of bullet tension to build the pressure - COL is dictated by how much of bullet HAS to be in the neck.</p><p>- F-Class is battle of velocity vs pressure - you want the bullet out of the case to gain a bit more capacity, but not as far as to jam because of the pressure spike.</p><p>- Short range benchrest - that's where you can really shine with bullet jump. Bullet jump gives a very fine adjustment on velocity and pressure - finer than any other reloading technique can do - powder, primer or neck tension.</p><p></p><p>P.S. I keep hearing that longer jump might make bullet start yawing before engaging the lands - it just doesn't make sense, since the bullet is still in the neck of the case when it gets to the rifling. Be it 0.010 or 0.050 jump - the bullet is guided by the neck, and if it was not concentric no jumping or jamming will fix that.</p></blockquote><p></p>
[QUOTE="MoBoost, post: 2088609, member: 3455"] Bullet jump is meaningless unless you have a custom chamber. You seem to be on the "bullet jump" crusade. Bullet jump is at the bottom, and I mean very very bottom of the accuracy ladder. In your testing you might have ran into "A-HA!" moment - but it has to do more with pressure/velocity/harmonics that you would've seen in your OCW test. For me it's a simple idea of statistics - once the mechanics are sorted out (type of bullet that works with particular twist and type of rifling) harmonics plays such an astonishingly HUGE role in the accuracy - it just has to be the only thing that matters for all practical purposes. I use different approach to different type of shooting. - A lot of times the COL is dictated by mag length - like hunting and high-power. - Reduced loads need a lot of bullet tension to build the pressure - COL is dictated by how much of bullet HAS to be in the neck. - F-Class is battle of velocity vs pressure - you want the bullet out of the case to gain a bit more capacity, but not as far as to jam because of the pressure spike. - Short range benchrest - that's where you can really shine with bullet jump. Bullet jump gives a very fine adjustment on velocity and pressure - finer than any other reloading technique can do - powder, primer or neck tension. P.S. I keep hearing that longer jump might make bullet start yawing before engaging the lands - it just doesn't make sense, since the bullet is still in the neck of the case when it gets to the rifling. Be it 0.010 or 0.050 jump - the bullet is guided by the neck, and if it was not concentric no jumping or jamming will fix that. [/QUOTE]
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