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280AI trim length

 
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  #22  
Old 02-25-2013, 10:03 AM
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Re: 280AI trim length

Quote:
Originally Posted by woods View Post
I have the older Ackley chamber done by Hart when they rebarreled. I discovered the problem after I used some Nosler 280AI brass. The primers looked like this



wondering what was going on when IDbound clued me in with his post

280AI question

and directed me to GunSmith talk about it

280 Ackley Improved Alert | GunsmithTalk

Now I just use 280 rem caliber brass and I don't have a problem. I still used the Nosler 280AI brass after it was fireformed with no problem but flattened primers like that are not something to repeat.

So according to all information that I have seen, the Nosler 280AI brass is made smaller to fit the new SAAMI specs with appropriate headspace. But that also means that Nosler 280AI brass will fit in either the new or the old chambers.
Nosler has loading data for other AI cases and they all match what in Sierra manual and since those manuals been out for a number of years that would be a good source for loading data. The 280AI in those manuals is bigger than the 280 case since the case was blown out and the Nosler 280AI brass is larger then those two case in earlier Nolser manual and 280AI in Sierra manual. Sierra/Nosler had case dia at the shoulder .450" and SAAMI spec is .454" and they lengthen the case body .007" and to the start of neck .005" so it has little more case capacity. they keep case length 2.525"

What Nosler did if you look at cases like 22-250,243,6rem,270,257,30-06 that have been used for the AI case dia at the shoulder has been .454/.455". Nolser change the dia from .450" to .454" to bring in more to the AI dia.

I'm sure die's were made to those two diagrams in earlier Nolser/Sierra manuals and I'm sure if they were different it would of been known.

there is also a 280 Improved which is listed in "THE HANDLOADER'S MANUAL OF CARTRIDGE CONVERSIONS" which is different also.

I'm looking at reloading manuasl that have those two prints of the 280AI and Nosler SAAMI Spec print and if your chamber was different you made of had something else.
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  #23  
Old 02-25-2013, 06:00 PM
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Re: 280AI trim length



I have the older true 280AI chamber and when I use Nosler 280AI brass I have .014"+ headspace

Don't know how to make it any plainer than that
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  #24  
Old 02-25-2013, 06:31 PM
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Re: 280AI trim length

Quote:
Originally Posted by woods View Post


I have the older true 280AI chamber and when I use Nosler 280AI brass I have .014"+ headspace

Don't know how to make it any plainer than that
Here is SAAMI spec for the 280AI

http://www.saami.org/PubResources/CC...20Improved.pdf

What can I say you haven't shown Headspace Dimensions you sure can't take a Reference Dimension and call that Headspace anyway you SAAMI Spec case is too long
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  #25  
Old 02-26-2013, 01:21 PM
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Re: 280AI trim length

Metal2meat, redding makes two different full length dies one says 280 improved 40 degree which is for the older chambering and i believe the newer one says. 280 ackley.
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  #26  
Old 02-26-2015, 09:34 PM
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Re: 280AI trim length

Quote:
Originally Posted by J E Custom View Post
You need to know what your chamber length is .

SAAMI spec is 2.525 for the AI and 2.540 for the 280 rem.

Nosler is the only one loading the 280 AI and recently standardized it by submitting it to
SAAMI (It had not been one of the SAAMI cartriges before).

It almost looks like they wanted to corner the ammo market for the AI version because they
changed the dimensions slightly over the standard AI reamers of the past. they were designed
to fire form using the standard 280 Rem cases.

Older AI reamers are made long enough to fire form 280 ammo in them. This is the reason
you need to find out what is the case length in your chamber.

If a fired 280 case will fit in your chamber with out effort it is probably OK, if not you chamber
is to short to use without trimming.

Ultimately what you want is a case neck that is .010 to .020 shorter than your chamber.

J E CUSTOM
What I don't get is the 280 Rem minimum chamber length is 2.56. The 280 Ackley minimum chamber length is 2.56. So why would the case length spec on the 280 Rem be 2.54 and the Ackley be 2.525? Regardless of the angle of the shoulder and length of the neck wouldn't you be more consistent in establishing what length short of the chamber would be your target?

Is a gun is chambered SAAMI 2.56 I would think your trim length would be around 2.54 as well? Or am I reading these wrong? I understand the difference in shoulder location from the old AI to the new specs... but as far as target trim length it seems they would be similar. It seems the SAAMI case length is too short.

http://www.saami.org/pubresources/cc...%20Express.pdf

http://www.saami.org/pubresources/cc...20Improved.pdf

Last edited by boog; 02-26-2015 at 09:40 PM. Reason: Added links
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