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270 AI

 
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  #1  
Old 05-02-2006, 12:37 AM
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270 AI

looking into getting one of these. would want to shoot 130 or 140 grainers. i know nothing about this cartridge, how do i make 270 AI brass? can it be bought? i am a pretty novice, in experienced hand loader, should i stay away from a 270 ai
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  #2  
Old 05-02-2006, 04:24 AM
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Re: 270 AI

.270 AI cases are formed by firing standard .270 WIN ammo in the AI chamber.
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Old 05-02-2006, 08:26 AM
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Re: 270 AI

so all that i have to do to make AI brass is shoot regular 270 winny ammo in the gun and the brass is formed?
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Old 05-02-2006, 09:26 AM
 
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Re: 270 AI

Yes
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Old 05-02-2006, 07:38 PM
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Re: 270 AI

It is not as simple as that. Factory 270 win ammo can be fired in a 270AI chamber, but I believe that there would be excessive case stretching in the case head/web area. This could result in case rupture after one or a few reloads. If you look in the Nosler reloading manual in the 280AI or 3006AI data, I believe they describe how to properly fireform cases. You can probably find some info on this site, or maybe someone can post a link for you. I have a 3006AI. Case forming is not difficult, but needs to be done properly.
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Old 05-02-2006, 07:55 PM
 
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Re: 270 AI

Guess it depends on the chamber. I have only worked with one and when you loaded a factory round in it the bolt would close with a little resistance. When shot, the AI case was formed. If the chamber is to long for a factory round to fit tight than you must keep the case against the bolt head. There are a few ways to do this. Leave the bullet out of the case far enough to jam into the lands or use 30-06 brass and only sizs the neck far enough so you can just close the bolt. There are probably some other ways also.
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Old 05-02-2006, 08:17 PM
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Re: 270 AI

Sambo , A properly cut Ackley improved chamber makes for a resistance fit with factory ammo , you should feel just a bit of pressure when the bolt is camed closed.
Alot of guys have their barrels rechambered to the Ai and the smith either is to lazey to set the shoulder back and do it right or doesen't see the need , when effect your ending up with a "Gibbs wanna be" chamber

Personaly I like the Ackley improvement of just about any case especialy the 30-06 family as they all have to much body taper and not enough shoulder.
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