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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="bigedp51" data-source="post: 1808337" data-attributes="member: 28965"><p>The 3rd chamber drawing, this time the SAAMI 30-06 and has a .3016 freebore diameter and .0032 clearance on each side of the bullet. The match chamber used by German Salazar has a .3085 freebore diameter and .00025 clearance on each side of the bullet.</p><p></p><p>You have a soft annealed neck and case shoulder contacting the shoulder of the chamber with circular machining marks. And you are telling us the soft brass is going to smoothly center itself and center the bullet. Somehow I don't think the chamber surface is smooth enough and accurate enough to center the bullet with .00025 clearance on each side of the bullet.</p><p></p><p>I will say it again there are too many variations in chamber dimensions to make a blanket statement that the case shoulder centers the bullet with the variations in freebore diameter and throat angles. On top of this the bullet enters the freebore long before the case shoulder contacts the shoulder of the chamber. Meaning the bullet has more to do with centering the front of the cartridge than the case shoulder.</p><p></p><p><img src="https://i.imgur.com/qkdayMb.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Now look again at the image below and freebore diameter (G) of the various chamber reamers compared to the bullet diameter of .224. </p><p></p><p><img src="https://i.imgur.com/wjAOlWq.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="bigedp51, post: 1808337, member: 28965"] The 3rd chamber drawing, this time the SAAMI 30-06 and has a .3016 freebore diameter and .0032 clearance on each side of the bullet. The match chamber used by German Salazar has a .3085 freebore diameter and .00025 clearance on each side of the bullet. You have a soft annealed neck and case shoulder contacting the shoulder of the chamber with circular machining marks. And you are telling us the soft brass is going to smoothly center itself and center the bullet. Somehow I don't think the chamber surface is smooth enough and accurate enough to center the bullet with .00025 clearance on each side of the bullet. I will say it again there are too many variations in chamber dimensions to make a blanket statement that the case shoulder centers the bullet with the variations in freebore diameter and throat angles. On top of this the bullet enters the freebore long before the case shoulder contacts the shoulder of the chamber. Meaning the bullet has more to do with centering the front of the cartridge than the case shoulder. [IMG]https://i.imgur.com/qkdayMb.jpg[/IMG] Now look again at the image below and freebore diameter (G) of the various chamber reamers compared to the bullet diameter of .224. [IMG]https://i.imgur.com/wjAOlWq.jpg[/IMG] [/QUOTE]
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Full Length or Neck Only; What's Best Resizing for Accuracy?
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