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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
280 SHERMAN MAX vs .280 A.I.
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<blockquote data-quote="elkaholic" data-source="post: 1036390" data-attributes="member: 13833"><p>I like to be as honest as I can with people and not try to blow a bunch of smoke. In the '06 sixed cases, there is less to be gained with the 280 Sherman over a 280 A.I. than with most of the Sherman cases. The reason is simple! The 280 Rem case is longer and has more capacity than other 'o6 sized cases to begin with, and when you improve it with the A.I. version, there isn't as much left to improve upon. Does this mean that it isn't worth it? In my opinion, no! If you can gain 2.6 grains capacity with no down side; why not? It is only slightly more difficult to form than the A.I. and you can gain about 50'. In the case of a 6.5-06 or a 30-06 A.I. vs a Sherman, you are gaining considerably more because of the much greater opportunity for case capacity by using a 270 or 280 parent. If 50' means nothing to you, then by all means build an A.I. which is a fine cartridge! My feeling about building a 280 Sherman is "if you're going to be a bear, you might as well be a grizzly"! My opinion is that the Sherman is a perfect balance between the Gibbs and the A.I. The Gibbs was always the velocity champ but did so at the expense of a poor case design (extremely short neck)! The A.I. was a good design, but left some velocity on the table. The Sherman case is the ballistic equal to the Gibbs, and has the case design attributes of the A.I. In answer to the question of real world; just add approx. 50' to whatever your 280 A.I. gets. Sometimes, by just adding 2 or 3 grains capacity, it puts you in an area where you can use one step up in a slower powder. This often means more of a gain than just having the capacity. The introduction of RL33 is a good example. Hope this helps..........Rich</p></blockquote><p></p>
[QUOTE="elkaholic, post: 1036390, member: 13833"] I like to be as honest as I can with people and not try to blow a bunch of smoke. In the '06 sixed cases, there is less to be gained with the 280 Sherman over a 280 A.I. than with most of the Sherman cases. The reason is simple! The 280 Rem case is longer and has more capacity than other 'o6 sized cases to begin with, and when you improve it with the A.I. version, there isn't as much left to improve upon. Does this mean that it isn't worth it? In my opinion, no! If you can gain 2.6 grains capacity with no down side; why not? It is only slightly more difficult to form than the A.I. and you can gain about 50'. In the case of a 6.5-06 or a 30-06 A.I. vs a Sherman, you are gaining considerably more because of the much greater opportunity for case capacity by using a 270 or 280 parent. If 50' means nothing to you, then by all means build an A.I. which is a fine cartridge! My feeling about building a 280 Sherman is "if you're going to be a bear, you might as well be a grizzly"! My opinion is that the Sherman is a perfect balance between the Gibbs and the A.I. The Gibbs was always the velocity champ but did so at the expense of a poor case design (extremely short neck)! The A.I. was a good design, but left some velocity on the table. The Sherman case is the ballistic equal to the Gibbs, and has the case design attributes of the A.I. In answer to the question of real world; just add approx. 50' to whatever your 280 A.I. gets. Sometimes, by just adding 2 or 3 grains capacity, it puts you in an area where you can use one step up in a slower powder. This often means more of a gain than just having the capacity. The introduction of RL33 is a good example. Hope this helps..........Rich [/QUOTE]
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280 SHERMAN MAX vs .280 A.I.
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