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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
243AI or 6mmAI m
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<blockquote data-quote="Trickymissfit" data-source="post: 515795" data-attributes="member: 25383"><p>case design is better due to the much longer neck length. This helps to keep the turbulence point out the the throat. The .243 neck length is too short to start with, and after fire forming cases ends up another .030" to .040" shorter. If you have a CAD program on your PC, then make a drawing of the shoulder neck area. Then extend the shoulders to where the cross in the neck. The 40 degree shoulder helps out a lot with the .243, but the T.P. is still too far out in the neck. It also seems to help with brass flow. Now if you draw the 6mmAI case and extend the shoulders to where they cross, and you'll see the difference</p><p>gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 515795, member: 25383"] case design is better due to the much longer neck length. This helps to keep the turbulence point out the the throat. The .243 neck length is too short to start with, and after fire forming cases ends up another .030" to .040" shorter. If you have a CAD program on your PC, then make a drawing of the shoulder neck area. Then extend the shoulders to where the cross in the neck. The 40 degree shoulder helps out a lot with the .243, but the T.P. is still too far out in the neck. It also seems to help with brass flow. Now if you draw the 6mmAI case and extend the shoulders to where they cross, and you'll see the difference gary [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
243AI or 6mmAI m
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