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Hunting
Long Range Hunting & Shooting
How much do we really gain from the A.I. rifles.
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<blockquote data-quote="J E Custom" data-source="post: 1403208" data-attributes="member: 2736"><p>You are exactly right, normally when a cartridge shoulder is changed to 40o, It is referred to as an AI (Ackley Improved) because he was the most prolific user of this shoulder angle. He also tested many different shoulder angles and found the 40o to be the optimum angle. There are other shoulder angles that are different degrees (30o, 35o and 37.5 degrees) that are often called AIs or just Improved. Normally If a person wildcats a cartridge and changes more than the shoulder angle to 40o, It is designated by the changes (Like a 338 Lapua improved 35o) for an example.</p><p></p><p>Normally the reamer maker is required to have everything that Is different than SAMME identified on the reamer, some smiths follow this</p><p>in detail on the barrel ID. others may simply mark it as a 338 Lapua AI,</p><p></p><p>I feel it is important to note everything different in the chamber on the barrel ID for safety and to minimize confusion if someone ends up with the rifle that has to load for it.</p><p></p><p>So whether or not you call the change AI or Improved, could make a big difference. If it is simply a cartridge that has the shoulder changed to 40o without changing anything else, Calling it an AI is fine but is other changes have been made, it needs to be identified with all the changes.</p><p></p><p>Just my opinion</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1403208, member: 2736"] You are exactly right, normally when a cartridge shoulder is changed to 40o, It is referred to as an AI (Ackley Improved) because he was the most prolific user of this shoulder angle. He also tested many different shoulder angles and found the 40o to be the optimum angle. There are other shoulder angles that are different degrees (30o, 35o and 37.5 degrees) that are often called AIs or just Improved. Normally If a person wildcats a cartridge and changes more than the shoulder angle to 40o, It is designated by the changes (Like a 338 Lapua improved 35o) for an example. Normally the reamer maker is required to have everything that Is different than SAMME identified on the reamer, some smiths follow this in detail on the barrel ID. others may simply mark it as a 338 Lapua AI, I feel it is important to note everything different in the chamber on the barrel ID for safety and to minimize confusion if someone ends up with the rifle that has to load for it. So whether or not you call the change AI or Improved, could make a big difference. If it is simply a cartridge that has the shoulder changed to 40o without changing anything else, Calling it an AI is fine but is other changes have been made, it needs to be identified with all the changes. Just my opinion J E CUSTOM [/QUOTE]
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How much do we really gain from the A.I. rifles.
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