Chambering Issue

[maverick]

I have a 280AI built on a Rem 700 receiver. The barrel is Kreiger and was reamed for the AI caliber. I have been fire forming 280 Rem ammo with no issue in chambering and accuracy. However, also in possession of a quantity of 280 Rem brass (in 280AI form) at least once fired by previous person for future reload which I purchased some time ago.. My issue is that these will not chamber safely after trying to load a number of them. I am not new to reloading and have tried every possible solution that I have come across to date. Any assistance will be truly appreciated...Thanks

 

[Bowhntr6pt]

I assume you already tried resizing the brass?

Mic good pieces and bad pieces... you might find something off... my guess is the actual shoulder is the problem.

 

[ChrisC]

Are you using a FL sizing die? Reamer varies from brand to brand. Try bumping the shoulder back 0.003”.

 

[.22 cents]

A comparator and headspace gauge set will help

 

[Baddog 0302]

Mark {color} completely the case or cases you are having trouble chambering with a marks-a-lot or other marking pen. Start with the base of the case up about 1" and the neck and shoulder area , then try to chamber almost forcing the bolt closed , then exam the case and see there the problem is.

 

[boatbum101]

Not all AI reamers are same . Many different versions with different shoulder angles . P.O. went with 40 degrees . Properly cut AI chamber allows fire-forming parent cases which yours does . Most logical assumption is the used brass was formed in another chamber / dies with different dimensions . Next time you get a barrel done get your 'smith to ream a FL die blank & a case gauge with same chambering reamer . That way you don't encounter same problem . No a bad idea even for standard calibers IMHO , especially with the costs of quality brass today .

 

[BluesBrother]

My guess without seeing the case after an attempted chambering would also be the shoulder. All sage advise given above.

 

[Jester896]

My issue is that these will not chamber safely after trying to load a number of them.

could you be more specific? Does it not want to go into the chamber? Does it go into the chamber but the bolt it hard to close? Do you have any type of comparator?

 

[maverick]

I assume you already tried resizing the brass?

Mic good pieces and bad pieces... you might find something off... my guess is the actual shoulder is the problem.

Yes, I have full length sized...Plan to do measures today...Thanks

 

[maverick]

could you be more specific? Does it not want to go into the chamber? Does it go into the chamber but the bolt it hard to close? Do you have any type of comparator?

Are you using a FL sizing die? Reamer varies from brand to brand. Try bumping the shoulder back 0.003”.

Will try bumpng the shoulder...Thanks...Have a Hornady

 

[maverick]

My guess without seeing the case after an attempted chambering would also be the shoulder. All sage advise given above.

Thanks for your input

 

[maverick]

could you be more specific? Does it not want to go into the chamber? Does it go into the chamber but the bolt it hard to close? Do you have any type of comparator?

 

[Bowhntr6pt]

Yes, I have full length sized...Plan to do measures today...Thanks

I suspect the shoulder angle will be the issue... look forward to your findings.

 

[maverick]

Will partially chamber, but not fully. Bolt can be extremely hard to close. Have a Hornady, need to head down that road...Thanks

 

[maverick]

I suspect the shoulder angle will be the issue... look forward to your findings.

What I also thought...Thanks

 

[maverick]

My guess without seeing the case after an attempted chambering would also be the shoulder. All sage advise given above.

Thanks...

 

[maverick]

Mark {color} completely the case or cases you are having trouble chambering with a marks-a-lot or other marking pen. Start with the base of the case up about 1" and the neck and shoulder area , then try to chamber almost forcing the bolt closed , then exam the case and see there the problem is.

Will try this...Thanks

 

[maverick]

I'm using Redding dies manuf. before 2011, so not the Nosler type later ones

 

[Baddog 0302]

Weather you are starting with new or fired ant then FL resized , it will probably help with the shoulder fire forming to your chamber if you start with a false shoulder that the case can head space. Very much like forming 30 Herrett cases. If you were near by I'd offer a few new 3006 cases to try the false shoulder , fire forming and then FL sizing your cases since this is probably a hunting rifle.

 

[BluesBrother]

Since it's a bolt gun it probably has a strong two or more lug lock up. I think I would try fire forming. However, my disclaimer is I accept no responsibility if you do.