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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Question on body taper.
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<blockquote data-quote="J E Custom" data-source="post: 339272" data-attributes="member: 2736"><p>The question of taper is a good one and I will try to answer It for you.</p><p></p><p>The more taper you have the easier it will be to extract because when the bolt is raised</p><p>the cam action will break it free and it will extract with no drag.</p><p></p><p>The less taper the harder the extraction because of spring back of the brass (It is</p><p>slightly larger than the Chamber after firing) and doesn't release as quickly as a more </p><p>tapered case.</p><p></p><p>Most Dangerous game cartriges have quite a bit of taper for assured extraction at all </p><p>times.</p><p></p><p>The advantage of less tapered cases is more powder capacity in the cartridge length</p><p>and better grip on the chamber during firing reducing bolt load.</p><p></p><p>The minimum case taper I would recomend is .006 per inch of case (A 3" case would have</p><p>.018 of case taper ) for dangerous game, and .008 to .010 Thousandths for the total</p><p>length of a case that will be used for normal hunting and target shooting.</p><p></p><p>You can go less but expect problems if the chamber is not perfect and very smooth or</p><p>if you intend to load hot for maximum velocity.</p><p></p><p>There are Lot's of opinions on optimum shoulder angles and I think a 37.5 degree </p><p>shoulder is about it.most ackleys are 40 degrees and they work well . </p><p></p><p>Blowing the shoulder out does increase powder capacity and is reported to increase</p><p>Accuracy and be easier on the brass.</p><p></p><p>Hope this helps</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 339272, member: 2736"] The question of taper is a good one and I will try to answer It for you. The more taper you have the easier it will be to extract because when the bolt is raised the cam action will break it free and it will extract with no drag. The less taper the harder the extraction because of spring back of the brass (It is slightly larger than the Chamber after firing) and doesn't release as quickly as a more tapered case. Most Dangerous game cartriges have quite a bit of taper for assured extraction at all times. The advantage of less tapered cases is more powder capacity in the cartridge length and better grip on the chamber during firing reducing bolt load. The minimum case taper I would recomend is .006 per inch of case (A 3" case would have .018 of case taper ) for dangerous game, and .008 to .010 Thousandths for the total length of a case that will be used for normal hunting and target shooting. You can go less but expect problems if the chamber is not perfect and very smooth or if you intend to load hot for maximum velocity. There are Lot's of opinions on optimum shoulder angles and I think a 37.5 degree shoulder is about it.most ackleys are 40 degrees and they work well . Blowing the shoulder out does increase powder capacity and is reported to increase Accuracy and be easier on the brass. Hope this helps J E CUSTOM [/QUOTE]
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Rifles, Bullets, Barrels & Ballistics
Question on body taper.
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