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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Improved case limits
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<blockquote data-quote="J E Custom" data-source="post: 552673" data-attributes="member: 2736"><p>P O Ackley did a lot of testing and recomended a minimum of .007 thousandths Per inch.</p><p>I normally stop at .009 to ease ejection.</p><p></p><p>As far as shoulder taper= again, Ackley recomended 40o max. and again being conservative</p><p>I like 37.5. There is almost no gain going to 40o and feeding is not a problem with 37.5 degrees.</p><p></p><p>On smaller diameter cases (3006 and down) 40 degrees seems to work fine. where feeding </p><p>starts to become an issue is with the magnum and larger cases unless provision are made</p><p>to the breach.</p><p></p><p>So I would say that the limit on both would be 40 degrees and .007 thousandths per inch body </p><p>taper.</p><p></p><p>One way to increase powder volume/capacity is to move the neck shoulder junction forward.</p><p>the minimum for small diameter bores (22 to 7mm) is one caliber in length.</p><p></p><p>On larger calibers (.308+) you can get buy with less because of the surface contact with the </p><p>bullet. A good example is the 300 win mag .308 bullet diameter and a neck length of .264.</p><p></p><p>So if I want to increase case capacity I blow the body out to .009 thou per inch and make </p><p>the shoulder angle 37.5 to 40 degrees and then move the shoulder forward the max possible</p><p>based on caliber and this gives me the maximum capacity of the case . I just wildcat-ed a 375 </p><p>RUM to 338 and increased powder capacity between 10 and 15 grains without a drop tube</p><p>depending on the type of powder.</p><p></p><p>I hope this gives you something to think about.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 552673, member: 2736"] P O Ackley did a lot of testing and recomended a minimum of .007 thousandths Per inch. I normally stop at .009 to ease ejection. As far as shoulder taper= again, Ackley recomended 40o max. and again being conservative I like 37.5. There is almost no gain going to 40o and feeding is not a problem with 37.5 degrees. On smaller diameter cases (3006 and down) 40 degrees seems to work fine. where feeding starts to become an issue is with the magnum and larger cases unless provision are made to the breach. So I would say that the limit on both would be 40 degrees and .007 thousandths per inch body taper. One way to increase powder volume/capacity is to move the neck shoulder junction forward. the minimum for small diameter bores (22 to 7mm) is one caliber in length. On larger calibers (.308+) you can get buy with less because of the surface contact with the bullet. A good example is the 300 win mag .308 bullet diameter and a neck length of .264. So if I want to increase case capacity I blow the body out to .009 thou per inch and make the shoulder angle 37.5 to 40 degrees and then move the shoulder forward the max possible based on caliber and this gives me the maximum capacity of the case . I just wildcat-ed a 375 RUM to 338 and increased powder capacity between 10 and 15 grains without a drop tube depending on the type of powder. I hope this gives you something to think about. J E CUSTOM [/QUOTE]
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Improved case limits
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