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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
What makes a cartridge accurate?
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<blockquote data-quote="Deleted member 46119" data-source="post: 1110718"><p>To me to "MAKE" a cartridge accurate means the loader, gunsmith and shooter do all they can with what they have. They try to "MAKE" everything accurate.</p><p></p><p>To me "make" is the physical characteristics if the cartridge. Those proportions, angles and radius's that "make" the powder burn in a uniform way. That "make" the bullet release in a uniform way. That "make" the chambered round seat in the chamber in a uniform way.</p><p></p><p>So to "make" a cartridge "accurate" the designer needs to get many things right. There doesn't seem to be a perfect formula for it.</p><p></p><p>Shoulder angle: There have been superbly accurate cartridges with low shoulder angles but reviewing cartridges perceived to be accurate, a shoulder angle of 30° to 40° seems to prevail.</p><p></p><p>Neck length: I just can't find any correlation between neck length and accuracy. 300WM, Dasher and a few more are pretty short aspect ratio (diameter to length) much shorter than the diameter of the bullet. On the other side, the 6.5x47L and 6mm Remington are long. Yet all those are known for supreme accuracy.</p><p></p><p>Case aspect ratio: as in length to shoulder vs diameter. It seems that shorter usually works better. Saying that, again the 300WM, RUM, STW all violate that concept but PPC, BR, WSM, RSAUM, 6.5-47L, Creedmoor all fit the shorter rather than longer idea.</p><p></p><p>Radius's: Almost every design uses "conventional" shoulder and neck radius. Weatherby used some pretty open radius. Pretty sure conventional contributes to accuracy more than Roy's but there is no formula either way.</p></blockquote><p></p>
[QUOTE="Deleted member 46119, post: 1110718"] To me to "MAKE" a cartridge accurate means the loader, gunsmith and shooter do all they can with what they have. They try to "MAKE" everything accurate. To me "make" is the physical characteristics if the cartridge. Those proportions, angles and radius's that "make" the powder burn in a uniform way. That "make" the bullet release in a uniform way. That "make" the chambered round seat in the chamber in a uniform way. So to "make" a cartridge "accurate" the designer needs to get many things right. There doesn't seem to be a perfect formula for it. Shoulder angle: There have been superbly accurate cartridges with low shoulder angles but reviewing cartridges perceived to be accurate, a shoulder angle of 30° to 40° seems to prevail. Neck length: I just can't find any correlation between neck length and accuracy. 300WM, Dasher and a few more are pretty short aspect ratio (diameter to length) much shorter than the diameter of the bullet. On the other side, the 6.5x47L and 6mm Remington are long. Yet all those are known for supreme accuracy. Case aspect ratio: as in length to shoulder vs diameter. It seems that shorter usually works better. Saying that, again the 300WM, RUM, STW all violate that concept but PPC, BR, WSM, RSAUM, 6.5-47L, Creedmoor all fit the shorter rather than longer idea. Radius's: Almost every design uses "conventional" shoulder and neck radius. Weatherby used some pretty open radius. Pretty sure conventional contributes to accuracy more than Roy's but there is no formula either way. [/QUOTE]
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What makes a cartridge accurate?
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