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Rifles, Reloading, Optics, Equipment
Gunsmithing
Barrel throating pros & cons
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<blockquote data-quote="specweldtom" data-source="post: 1328083" data-attributes="member: 2580"><p>B23, freebore is a bullet diameter cylindrical section of the chamber immediately in front of the case mouth. Throat (or leade) is a tapered section in front of the freebore that eases the bullet into the rifling. Many chambers don't have freebore, so the throat starts right in front of the case mouth. Some well-known freebored chambers are the Weatherby calibers... 0.162" for the .224 Wby Mag and up to 0.756" for the .378 and .460 Wby Mags. THAT'S NOT A MISSPRINT. 3/4" of freebore! Some not-so well-known freebored chambers are the Remington Ultra Mag calibers.</p><p>Speaking of the Weatherbys, Their factory ammo cannot be used in custom short or no freebore chambers. I saw a .30 x .378 custom no freebore rifle that bent the bottom metal and blew the floorplate open with factory 180gr ammo. Two other custom .30 x .378 rifles with factory dimension chambers shot the exact same ammo uneventfully. One of those rifles shot 5 handloads into 0.093" at 100 yds. The other shot 5 handloads into 0.237" at 100 yds. Both were heavy loaded, the first, I don't remember, The second (mine) was a 190gr Sierra mkhp, that I hunted with. </p><p>To quote a LRH member from years ago: "I do not fear freebore".</p><p>In fact on the boomers, I fear not having it.</p><p>I know the benchresters shoot no-jump loads, but they aren't loading over 100grs of powder either. </p><p></p><p>I get long-winded, but old guys do that.</p><p></p><p>Tom</p></blockquote><p></p>
[QUOTE="specweldtom, post: 1328083, member: 2580"] B23, freebore is a bullet diameter cylindrical section of the chamber immediately in front of the case mouth. Throat (or leade) is a tapered section in front of the freebore that eases the bullet into the rifling. Many chambers don't have freebore, so the throat starts right in front of the case mouth. Some well-known freebored chambers are the Weatherby calibers... 0.162" for the .224 Wby Mag and up to 0.756" for the .378 and .460 Wby Mags. THAT'S NOT A MISSPRINT. 3/4" of freebore! Some not-so well-known freebored chambers are the Remington Ultra Mag calibers. Speaking of the Weatherbys, Their factory ammo cannot be used in custom short or no freebore chambers. I saw a .30 x .378 custom no freebore rifle that bent the bottom metal and blew the floorplate open with factory 180gr ammo. Two other custom .30 x .378 rifles with factory dimension chambers shot the exact same ammo uneventfully. One of those rifles shot 5 handloads into 0.093" at 100 yds. The other shot 5 handloads into 0.237" at 100 yds. Both were heavy loaded, the first, I don't remember, The second (mine) was a 190gr Sierra mkhp, that I hunted with. To quote a LRH member from years ago: "I do not fear freebore". In fact on the boomers, I fear not having it. I know the benchresters shoot no-jump loads, but they aren't loading over 100grs of powder either. I get long-winded, but old guys do that. Tom [/QUOTE]
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