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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
.224 custom 100 grain ULD's for 1000 and 500yrd benchrest
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<blockquote data-quote="brianwinzor" data-source="post: 63369" data-attributes="member: 1067"><p><strong>Re: .224 custom 100 grain ULD\'s for 1000 and 500yrd benchrest</strong></p><p></p><p>Waltech Jim,</p><p></p><p>The 224 Clark is named after Ken Clark a Californian gunsmith who developed the case in 1962, afer previously experimenting with a variety of cases including a necked down 30/06. </p><p></p><p>The .224 Clark case is formed by necking down a .257 Roberts case to .224, and then fireforming in an improved chamber, with a 30 degree shoulder. </p><p></p><p>There is an excellent article by Layne Simpson on the .224 Clark in the Sept-Oct 1979 edition of the "Rifle". </p><p></p><p>In the article he states that Ken Clark " tried a variety of case forms, powders, bullet weights, and bullet shapes, and finally eliminated his problems with the cartridge. The toughest to overcome was the rapid barrel erosion, virtually inevitable with the burning of around 60 grains of powder in a .224 barrel. Clark's first solution was to use ball powders in a chromed bore. He now uses Shilen Chrome Moly barrels, and says that barrel life is on par with that of the 22/250 and .220 Swift."</p><p></p><p>Ken Clark told Simpson "that cases for the 6mm Remington cases could be used, but he found that they do not take loads as heavy as the Winchester 257 cases."</p><p></p><p>The case capacity of my first batch of Winchester .257 Roberts cases had a capacity of 58.1 grains after necking down to .224, and 63.8 grains after fireforming. (almost identical to a 22/284 I previously owned) The second batch of Winchester 257R brass were 57.1 grains when necked down, and 62.3 grains after fireforming. The usable capacity when filled with powder to the base of the neck is 55.0 grains of a long cut extruded powder such as IMR 7828, 56.5 grains of short cut extruded powder such as H1000, and 60.8 grains of ball powder.</p><p></p><p>The neck on my gunsmith's reamer measures .2543, which means I have to neck turn the cases to about .014 thickness to give adequate clearance. </p><p></p><p>Hope that gives you a little technical snapshot of the .224 Clark. Regards, Brian.</p></blockquote><p></p>
[QUOTE="brianwinzor, post: 63369, member: 1067"] [b]Re: .224 custom 100 grain ULD\'s for 1000 and 500yrd benchrest[/b] Waltech Jim, The 224 Clark is named after Ken Clark a Californian gunsmith who developed the case in 1962, afer previously experimenting with a variety of cases including a necked down 30/06. The .224 Clark case is formed by necking down a .257 Roberts case to .224, and then fireforming in an improved chamber, with a 30 degree shoulder. There is an excellent article by Layne Simpson on the .224 Clark in the Sept-Oct 1979 edition of the "Rifle". In the article he states that Ken Clark " tried a variety of case forms, powders, bullet weights, and bullet shapes, and finally eliminated his problems with the cartridge. The toughest to overcome was the rapid barrel erosion, virtually inevitable with the burning of around 60 grains of powder in a .224 barrel. Clark's first solution was to use ball powders in a chromed bore. He now uses Shilen Chrome Moly barrels, and says that barrel life is on par with that of the 22/250 and .220 Swift." Ken Clark told Simpson "that cases for the 6mm Remington cases could be used, but he found that they do not take loads as heavy as the Winchester 257 cases." The case capacity of my first batch of Winchester .257 Roberts cases had a capacity of 58.1 grains after necking down to .224, and 63.8 grains after fireforming. (almost identical to a 22/284 I previously owned) The second batch of Winchester 257R brass were 57.1 grains when necked down, and 62.3 grains after fireforming. The usable capacity when filled with powder to the base of the neck is 55.0 grains of a long cut extruded powder such as IMR 7828, 56.5 grains of short cut extruded powder such as H1000, and 60.8 grains of ball powder. The neck on my gunsmith's reamer measures .2543, which means I have to neck turn the cases to about .014 thickness to give adequate clearance. Hope that gives you a little technical snapshot of the .224 Clark. Regards, Brian. [/QUOTE]
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.224 custom 100 grain ULD's for 1000 and 500yrd benchrest
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