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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Belted Magnum Cartridges
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<blockquote data-quote="Bart B" data-source="post: 126682" data-attributes="member: 5302"><p>[ QUOTE ]</p><p>Has anybody ever used the innovative technologies belted magnum sizing die? <a href="http://www.larrywillis.com" target="_blank">www.larrywillis.com</a> </p><p>he claims this is the answer to the swelling in the case just above the belt.</p><p></p><p>[/ QUOTE ]Most of the folks who years ago shot 28 and 30 caliber magnums in 1000-yard matches winning most of them and setting records along the way did just that. And their chambers were normal SAAMI minimum sizes. But they used a regular full-length sizing die cut off just above the belt clearance recess as well as a bit below the die's shoulder then truing and cleaning up the edges so they're not sharp. This "body sizing" die needs to be set in the press such that the bottom of it touches the belt when the ram's at the top of its stroke. Doing this reduced fired belted case body diameters all the way to the belt whereas regular full-length sizing dies stopped short. By making the fired belted cases size back to almost new case dimensions, accuracy was excellent and surpassed any type of neck or partial neck sizing. Nothing's changed since then.</p><p></p><p>Some top long range shooters asked top die makers to make a body sizing die to use after sizing fired belted cases first with a conventional die. But they didn't think enough would be sold to make it worthwhile.</p><p></p><p>I've always got best accuracy with .30-.338 Win. Mag., .30-.338 Keele Mag. (same body size as standard .30-.338 but uses .300 Win. Mag. cases to have a much longer neck) and the .300 Win. Mag. using new cases or fired ones full-length sized with a conventional die, then using the body die to size the body all the way to the belt back to almost new case dimensions. Setting the shoulder back about .005-inch from its fired position and letting the sized cases headspace on the belt like they're supposed to allows cases to be fired and resized at least 15 times. Some folks report over 20 reloads per case using a regular full-length followed by the body sizing die. And 1/2 to 2/3 MOA accuracy at 1000 yards is about normal with good barrels and match bullets. One can expect sub MOA accuracy through 200 and maybe 300 yards with hunting bullets using this method. I'm talking about accuracy being determined by shooting at least 15 shots per test group.</p><p></p><p>Neck sizing fired belted cases lets the shoulder be far enough away from the head that when chambered, the swelled section directly in front of the belt is held clear of the belt headspacing shoulder at the back of the barrel's chamber. If this swelled section isn't reduced back to about new case dimensions and normal full-length sizing dies are used, that swelled section, or step, will interfere with the headspacing belt in the chamber and hurt accuracy. All this is why most folks get better accuracy with neck sized belted cases. Size that step back down and great things will happen.</p></blockquote><p></p>
[QUOTE="Bart B, post: 126682, member: 5302"] [ QUOTE ] Has anybody ever used the innovative technologies belted magnum sizing die? [url="http://www.larrywillis.com"]www.larrywillis.com[/url] he claims this is the answer to the swelling in the case just above the belt. [/ QUOTE ]Most of the folks who years ago shot 28 and 30 caliber magnums in 1000-yard matches winning most of them and setting records along the way did just that. And their chambers were normal SAAMI minimum sizes. But they used a regular full-length sizing die cut off just above the belt clearance recess as well as a bit below the die's shoulder then truing and cleaning up the edges so they're not sharp. This "body sizing" die needs to be set in the press such that the bottom of it touches the belt when the ram's at the top of its stroke. Doing this reduced fired belted case body diameters all the way to the belt whereas regular full-length sizing dies stopped short. By making the fired belted cases size back to almost new case dimensions, accuracy was excellent and surpassed any type of neck or partial neck sizing. Nothing's changed since then. Some top long range shooters asked top die makers to make a body sizing die to use after sizing fired belted cases first with a conventional die. But they didn't think enough would be sold to make it worthwhile. I've always got best accuracy with .30-.338 Win. Mag., .30-.338 Keele Mag. (same body size as standard .30-.338 but uses .300 Win. Mag. cases to have a much longer neck) and the .300 Win. Mag. using new cases or fired ones full-length sized with a conventional die, then using the body die to size the body all the way to the belt back to almost new case dimensions. Setting the shoulder back about .005-inch from its fired position and letting the sized cases headspace on the belt like they're supposed to allows cases to be fired and resized at least 15 times. Some folks report over 20 reloads per case using a regular full-length followed by the body sizing die. And 1/2 to 2/3 MOA accuracy at 1000 yards is about normal with good barrels and match bullets. One can expect sub MOA accuracy through 200 and maybe 300 yards with hunting bullets using this method. I'm talking about accuracy being determined by shooting at least 15 shots per test group. Neck sizing fired belted cases lets the shoulder be far enough away from the head that when chambered, the swelled section directly in front of the belt is held clear of the belt headspacing shoulder at the back of the barrel's chamber. If this swelled section isn't reduced back to about new case dimensions and normal full-length sizing dies are used, that swelled section, or step, will interfere with the headspacing belt in the chamber and hurt accuracy. All this is why most folks get better accuracy with neck sized belted cases. Size that step back down and great things will happen. [/QUOTE]
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