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Fire-forming 280 Ackley Improved from Lapua 30-06?

 
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  #8  
Old 10-24-2010, 03:41 PM
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Re: Fire-forming 280 Ackley Improved from Lapua 30-06?

This is my very first custom built rifle. As such, I am taking the advice of people and going with it. There is a guy here locally in Phoenix who has a 280 AI and he had his built as a tight neck. It has INCREDIBLE accuracy so I was trying to get mine built the same as his.

With all of that being said, my rifle will be a tight neck with a neck diameter of .311. I have a couple of more questions for your guys:

1. Because my gun is a tight neck, my gunsmith told me that I would not be able to fire-form factory 280 ammo. Does this mean I won't be able to fire form 30-06 ammo also?
2. Is there another kind of Lapua brass I can use so that I don't create a false shoulder? How about the Lapua 6.5 X 284?
3. Will a false shoulder effect my accuracy?

Thanks in advance!

Last edited by jeffwhip; 10-24-2010 at 03:45 PM.
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  #9  
Old 10-24-2010, 10:24 PM
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Re: Fire-forming 280 Ackley Improved from Lapua 30-06?

Nosler is supposed to have .280AI brass in stock any day now. I am holding out for that because fire-forming hasn't been all that kind to me.
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  #10  
Old 10-24-2010, 10:41 PM
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Re: Fire-forming 280 Ackley Improved from Lapua 30-06?

What kind of casing were you trying to fire form from? Is that a 30-06 case?
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  #11  
Old 10-24-2010, 11:14 PM
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Re: Fire-forming 280 Ackley Improved from Lapua 30-06?

That's what happens when the case head isn't held firmly against the bolt face. Case head separation.
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  #12  
Old 10-25-2010, 12:51 AM
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Re: Fire-forming 280 Ackley Improved from Lapua 30-06?

Quote:
Originally Posted by jeffwhip View Post
This is my very first custom built rifle. As such, I am taking the advice of people and going with it. There is a guy here locally in Phoenix who has a 280 AI and he had his built as a tight neck. It has INCREDIBLE accuracy so I was trying to get mine built the same as his.

With all of that being said, my rifle will be a tight neck with a neck diameter of .311. I have a couple of more questions for your guys:

1. Because my gun is a tight neck, my gunsmith told me that I would not be able to fire-form factory 280 ammo. Does this mean I won't be able to fire form 30-06 ammo also?
2. Is there another kind of Lapua brass I can use so that I don't create a false shoulder? How about the Lapua 6.5 X 284?
3. Will a false shoulder effect my accuracy?

Thanks in advance!
I would not recommend attempting the use of a false shoulder in your case. I also would not attempt to try to make .280 cases out of 30-06 brass. If you have to use another case, then use the .270 Winchester case. To take this further, I'd simply recommend you start out with a strait .280 Remington chamber.
gary
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  #13  
Old 10-25-2010, 03:26 AM
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Re: Fire-forming 280 Ackley Improved from Lapua 30-06?

Quote:
Originally Posted by jeffwhip View Post
What kind of casing were you trying to fire form from? Is that a 30-06 case?
I fire-formed 100 Lapua 30-06 brass to the 280 RCBS Improved - 30 degree shoulder. About the same thing as the 280 AI, but with slightly less angle on the shoulder. It can be done. It does take a bit of time and fussing. I believe I annealed the case neck shoulder junction prior to fire-forming. The shoulders blew out just fine on mine. As I stated in my PM to you, the bullet must be jammed into the lands, and tightly enough so that the case head cannot leave the bolt face when the firing pin strikes the primer. I believe I used 175 grain Hornady round nose bullets for purposes of fire-forming.

Once the initial fire-forming is completed, 100 Lapua brass will last close to the life of the barrel, unless you run them near top pressures.
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  #14  
Old 10-25-2010, 11:13 AM
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Re: Fire-forming 280 Ackley Improved from Lapua 30-06?

If you turn your necks to thickness first you should not have a problem leaving a false shoulder. I would use .280 dies with an appropriate sized bushing to create the shoulder. The only reason I suggest neck turning first is so that you do not have to neck them down, then turn them, then size them up, then partially size them down. The brass may thicken slightly when you size it down so use a ball mic to make sure that your desired thickness is obtained. To create your false shoulder I would set my die to fully size the brass. Then I would use a spacer under the die to hold the die short. I have a bunch of different thickness 7/8 washers that I use for this. It has been a loong time since I did this but am thinking that I had to use 4 .015 washers to give me a crush fit on the 06 cases, but my chamber may differ from yours. It can be done but I would not solely rely on using the bullet to keep the case against the bolt face, IMO a false shoulder is the best way. If you just have to have the lapua brass as I did it is a bunch more work and may not be worth the gains. If I had it to do over I would probably just use the nosler brass even though it is softer than the lapua.
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