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Rifles, Reloading, Optics, Equipment
Reloading
Too much jump?
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<blockquote data-quote="Batsin" data-source="post: 3036952" data-attributes="member: 126867"><p>Possibly so. I use the word "shank" the way that Brian LItz does in the linked article. In the article, Litz defines the shank as "the full caliber straight section". With the bullets measured in this thread, the ogives terminate at the full or "caliber diameter" of 0.257", which also happens to be the shank diameter. I agree that terms can be different with bore-riding bullets where only the driving bands are the full "caliber diameter" and the shank would typically be the major, bore or land diameter (terms that are generally used interchangeably).</p><p></p><p>Nevertheless, with all of the loadings shown in post 21, there will be a section of "the full caliber straight section" inside the freebore of the chamber unless there is something very odd about this particular "25 Creedmoor" freebore/throat. It appears that the Original Poster's chamber has an unusually long freebore. I wonder if the gunsmith misunderstood the request to make the chamber for "really long, high-BC bullets". Some high-BC bullets are long because they utilize unusually long ogives and relatively shorter shanks. With these bullets, you actually need a shorter freebore. The freebore on the reamer drawings for the 131 Blackjack bullet, which is said to work well with the 133 and 135 Bergers, for example range from .115" to .131". As can be seen from the JGS reamer drawing, any section of bullet extending beyond 1.9413" will either be in the .2575" dia freebore, throat, or rifled bore</p><p></p><p>Article:</p><p><strong>Tangent, Secant, Hybrid Ogive Bullets:</strong></p><p>Bryan Litz Explains Characteristics of Different Bullet Ogive Designs</p><p>[URL unfurl="true"]https://www.accurateshooter.com/ballistics/tangent-vs-secant-vs-hybrid-ogive-bullets/[/URL]</p><p></p><p>[ATTACH=full]544795[/ATTACH]</p><p></p><p>[ATTACH=full]544786[/ATTACH]</p></blockquote><p></p>
[QUOTE="Batsin, post: 3036952, member: 126867"] Possibly so. I use the word "shank" the way that Brian LItz does in the linked article. In the article, Litz defines the shank as "the full caliber straight section". With the bullets measured in this thread, the ogives terminate at the full or "caliber diameter" of 0.257", which also happens to be the shank diameter. I agree that terms can be different with bore-riding bullets where only the driving bands are the full "caliber diameter" and the shank would typically be the major, bore or land diameter (terms that are generally used interchangeably). Nevertheless, with all of the loadings shown in post 21, there will be a section of "the full caliber straight section" inside the freebore of the chamber unless there is something very odd about this particular "25 Creedmoor" freebore/throat. It appears that the Original Poster's chamber has an unusually long freebore. I wonder if the gunsmith misunderstood the request to make the chamber for "really long, high-BC bullets". Some high-BC bullets are long because they utilize unusually long ogives and relatively shorter shanks. With these bullets, you actually need a shorter freebore. The freebore on the reamer drawings for the 131 Blackjack bullet, which is said to work well with the 133 and 135 Bergers, for example range from .115" to .131". As can be seen from the JGS reamer drawing, any section of bullet extending beyond 1.9413" will either be in the .2575" dia freebore, throat, or rifled bore Article: [B]Tangent, Secant, Hybrid Ogive Bullets:[/B] Bryan Litz Explains Characteristics of Different Bullet Ogive Designs [URL unfurl="true"]https://www.accurateshooter.com/ballistics/tangent-vs-secant-vs-hybrid-ogive-bullets/[/URL] [ATTACH type="full" alt="Released JGS 25 CREED Blackjack Spec Rev 2 0.290 neck.png"]544795[/ATTACH] [ATTACH type="full" alt="25 Creedmoor Blackjack Rev 2 Manson.png"]544786[/ATTACH] [/QUOTE]
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