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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Full Length or Neck Only; What's Best Resizing for Accuracy?
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<blockquote data-quote="tim_w" data-source="post: 1847517" data-attributes="member: 11132"><p>Even with zero freebore you still have a leade which acts as a centering alignment cone. Not to mention the bullet dimensions used. </p><p></p><p>Look at the primary bullet design used in the 30BR when no freebore is cut. They are using short flat base bullets under 1.00" jackets most 7 tangent ogives. Those using longer bullets seem to be adding some freebore. Compare this in contrast to all bullets used in LR shooting. They tend to have much longer bodies with bt and longer necks with hybrid transitional ogives etc. Having freebore in the latter has a greater effect as there is a need. The short bodied 30BR bullets do not have this.</p><p></p><p>Consider the small groups seen fireforming wildcatts where shoulder angle as well as headspace distance are certainly not in play. A jammed bullet and possibly in concert with a shelf shoulder in the neck base nothing close to the alignment surface area or angle hi of the case shoulder.</p><p></p><p> It would seem difficult to support a theory that the case shoulder is primarily responsible for the alignment properties of bullet to bore centerline. Yet deny a similar design alignment cone that has direct contact with ogive of the bullet itself is the primary guide in aligning the bullet itself to bore centerline.</p><p></p><p>I would say this. The shoulder is responsible for centering the case and the throat (freebore & leade) is responsible for aligning the bullet to the bore.</p><p></p><p>Looking at the relationship I would say the case shoulder is akin to "coarse" alignment of the bullet and throat is "fine" alignment. </p><p></p><p>It all plays a role. I think it really can be seen as simple as shoulder centers case and throat centers bullet. Ones secondary or primary to the other.</p></blockquote><p></p>
[QUOTE="tim_w, post: 1847517, member: 11132"] Even with zero freebore you still have a leade which acts as a centering alignment cone. Not to mention the bullet dimensions used. Look at the primary bullet design used in the 30BR when no freebore is cut. They are using short flat base bullets under 1.00" jackets most 7 tangent ogives. Those using longer bullets seem to be adding some freebore. Compare this in contrast to all bullets used in LR shooting. They tend to have much longer bodies with bt and longer necks with hybrid transitional ogives etc. Having freebore in the latter has a greater effect as there is a need. The short bodied 30BR bullets do not have this. Consider the small groups seen fireforming wildcatts where shoulder angle as well as headspace distance are certainly not in play. A jammed bullet and possibly in concert with a shelf shoulder in the neck base nothing close to the alignment surface area or angle hi of the case shoulder. It would seem difficult to support a theory that the case shoulder is primarily responsible for the alignment properties of bullet to bore centerline. Yet deny a similar design alignment cone that has direct contact with ogive of the bullet itself is the primary guide in aligning the bullet itself to bore centerline. I would say this. The shoulder is responsible for centering the case and the throat (freebore & leade) is responsible for aligning the bullet to the bore. Looking at the relationship I would say the case shoulder is akin to "coarse" alignment of the bullet and throat is "fine" alignment. It all plays a role. I think it really can be seen as simple as shoulder centers case and throat centers bullet. Ones secondary or primary to the other. [/QUOTE]
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Full Length or Neck Only; What's Best Resizing for Accuracy?
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