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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
.300 WM Win Laredo - Twist?
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<blockquote data-quote="LouBoyd" data-source="post: 619972" data-attributes="member: 9253"><p>I would suggest you measure the length of the magazine in your Win 70 Laredo before attempting to use 210 Bergers. The SAAMI spec for cartridge OAL of the 300 Win mag cartridge is only 3.34" with a case length of 2.62" The ogive of a 210 Berger is 0.805". Some manufacturers like Remington and SAKO give their 300 Win Mags a 3.6" full length magnum magazine instead of the originally designed medium length magnum. I don't believe Winchester ever did in the Laredo. </p><p></p><p>There are relatively few factory rifle/cartridge combinations which will properly shoot heavy VLD bullets from a magazine by design or by chance. Practically no VLD bullets existed before the 1980s by which time most of the popular belted magnums and 308 or 30-06 derived cases already had SAAMI standards set. In the WSM, WSSM, RUM, and SAUM cartridges the existence of VLD bullets was simply ignored by the factory cartridge/rifle developers at both Winchester and Remington. The primary market was medium range hunting. Mostly by accident the Rem 700 long actions would shoot some of the older mid length cartridges with low drag bullets. In practice to shoot VLD bullets properly a custom or semi-custom rifle with at least an extended magazine and custom throat is very desirable. Even a 3.6" magazine is short for shooting 210 Bergers in a 300 Win mag with ideal seating depth.</p></blockquote><p></p>
[QUOTE="LouBoyd, post: 619972, member: 9253"] I would suggest you measure the length of the magazine in your Win 70 Laredo before attempting to use 210 Bergers. The SAAMI spec for cartridge OAL of the 300 Win mag cartridge is only 3.34" with a case length of 2.62" The ogive of a 210 Berger is 0.805". Some manufacturers like Remington and SAKO give their 300 Win Mags a 3.6" full length magnum magazine instead of the originally designed medium length magnum. I don't believe Winchester ever did in the Laredo. There are relatively few factory rifle/cartridge combinations which will properly shoot heavy VLD bullets from a magazine by design or by chance. Practically no VLD bullets existed before the 1980s by which time most of the popular belted magnums and 308 or 30-06 derived cases already had SAAMI standards set. In the WSM, WSSM, RUM, and SAUM cartridges the existence of VLD bullets was simply ignored by the factory cartridge/rifle developers at both Winchester and Remington. The primary market was medium range hunting. Mostly by accident the Rem 700 long actions would shoot some of the older mid length cartridges with low drag bullets. In practice to shoot VLD bullets properly a custom or semi-custom rifle with at least an extended magazine and custom throat is very desirable. Even a 3.6" magazine is short for shooting 210 Bergers in a 300 Win mag with ideal seating depth. [/QUOTE]
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.300 WM Win Laredo - Twist?
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