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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
is the 7PRC killing the 7saum?
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<blockquote data-quote="tim_w" data-source="post: 2642300" data-attributes="member: 11132"><p>The thing that spurs new cartridges is what I call the SAAMI Immortality Effect. Once a proper functioning cartridge is given SAAMI or CIP status that's it in perpetuity. For obvious reason that cartridge spec is set in concrete. You might be able to get a change to a recommended twist rate but no way are you getting a COAL or freebore change for safety reasons for one.</p><p></p><p>Hunting rifles last generations and technology advances. Look back at when the 3006 308 7RM 300RM 243 WM 270 etc where created and when SAAMI listed them. What were the longest bullets that those cases would propell with powders of that time.</p><p></p><p>The cartridge SAAMI members have been putting forth since 2000-2010, IMHO, have no excuse. </p><p></p><p>I know how I would go about creating a new cartridge and they would all, for one, have reasonably long necks. The COAL would be set by the longest cup/core bullet that could be reasonably propelled from that case vol. It would be set by bullet bt junc set just above neck junc. Neck length would be dictated be the shortest bullets ogive planned to match that longest bullet BTO. Twist rate established by the longest. That would then dictate the action size and mag etc used.</p></blockquote><p></p>
[QUOTE="tim_w, post: 2642300, member: 11132"] The thing that spurs new cartridges is what I call the SAAMI Immortality Effect. Once a proper functioning cartridge is given SAAMI or CIP status that's it in perpetuity. For obvious reason that cartridge spec is set in concrete. You might be able to get a change to a recommended twist rate but no way are you getting a COAL or freebore change for safety reasons for one. Hunting rifles last generations and technology advances. Look back at when the 3006 308 7RM 300RM 243 WM 270 etc where created and when SAAMI listed them. What were the longest bullets that those cases would propell with powders of that time. The cartridge SAAMI members have been putting forth since 2000-2010, IMHO, have no excuse. I know how I would go about creating a new cartridge and they would all, for one, have reasonably long necks. The COAL would be set by the longest cup/core bullet that could be reasonably propelled from that case vol. It would be set by bullet bt junc set just above neck junc. Neck length would be dictated be the shortest bullets ogive planned to match that longest bullet BTO. Twist rate established by the longest. That would then dictate the action size and mag etc used. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
is the 7PRC killing the 7saum?
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