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280 AI (again)

 
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  #15  
Old 05-27-2013, 07:31 PM
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Re: 280 AI (again)

this makes for good reading

New and Improved: The .280 Ackley Improved - RifleShooter

The .280 Ackley
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  #16  
Old 05-27-2013, 09:40 PM
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Re: 280 AI (again)




So why isn't there any movement since the rifle is standard and brass is SAAMI.
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  #17  
Old 05-28-2013, 12:21 AM
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Re: 280 AI (again)

And then there's this which fits with what Iv found with nosler brass in an original chamber.
https://gunsmithtalk.wordpress.com/2...eadspace-test/

And so the discussion goes back and forth
.Brent you should try some Nosler brass. Measure the headspace with an appropriate gauge before and after and see if it grows after firing .Actually it would be prudent to measure 3 datums across the shoulder.
If there is indeed a 14thou difference then a properly fire formed case should end up at least .014 longer than a new case. In my case with a 280ai cooper it doesn't grow at all.
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  #18  
Old 05-28-2013, 02:55 AM
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Re: 280 AI (again)

Now to muddy the water in the below article click on the case and you see the case that was in Sierra manual and Nosler before Nosler decide to do the SAAMI Spec 280AI. On page two of the article they mention loading data from those manuals.

.280 Ackley Improved | Gear | Guns & Ammo

That case in those two manual is what Nosler changed for their SAAMI spec 280AI. My new Nosler 280AI brass length is 2.525"
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Old 05-28-2013, 08:09 AM
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Re: 280 AI (again)

I will check it out. I have the right tooling to check. I will take all the necc. precautions to FF these just in case.
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  #20  
Old 05-29-2013, 02:09 AM
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Re: 280 AI (again)

Quote:
Originally Posted by TOM H View Post
Now to muddy the water in the below article click on the case and you see the case that was in Sierra manual and Nosler before Nosler decide to do the SAAMI Spec 280AI. On page two of the article they mention loading data from those manuals.

.280 Ackley Improved | Gear | Guns & Ammo

That case in those two manual is what Nosler changed for their SAAMI spec 280AI. My new Nosler 280AI brass length is 2.525"
Interesting and the base to neck/shoulder junction reads 2.175 which is only .001 off the above diagram of the supposedly new saami version. Tis only a sketch though.
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  #21  
Old 05-29-2013, 08:18 AM
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Re: 280 AI (again)

Quote:
Originally Posted by yawn View Post
Interesting and the base to neck/shoulder junction reads 2.175 which is only .001 off the above diagram of the supposedly new saami version. Tis only a sketch though.
There is no way you can blow 280 case out to the SAAMI spec 280AI and keep the same case length @ 2.540".

My big question how close was the older 280AI prior to SAAMI spec to what was published in Sierra/Nosler manuals?

Why would Sierra and Nosler publish case spec and loading data for a 280AI prior to SAAMI spec 280AI if that wasn't the case being used at the time, they both had reamers. If you look at Ackley book vol I for the 280 Improved(Ackley) all the loading data came from RCBS page 395/396.

Got to wonder sometimes.
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