Peterson .280 AI Brass Won’t Extract

[KGLee357]

Good Morning All,

I recently purchased a Cooper 92 chambered in .280 AI. Round count per the original owner is 15-20, all Hornady factory ammo with no issues. I bought 100 rounds of Peterson .280 AI brass to do load development with. Prior to doing any loading, I decided to cycle a piece of bare brass through the rifle to verify function. To my surprise, the case would not extract when chambered. It was not stuck and slid back out of the chamber with no resistance when I held the rifle vertically. I removed the bolt and verified that the extractor claw was intact and that the brass would fit appropriately in the bolt face. I tried a second piece of brass, which did extract once but then failed on subsequent attempts. Is this a headspace issue? Should I load a round and see if it will fire form and then subsequently extract? Should I try different brass or factory ammo? This is obviously frustrating, given that I spent quite a bit of money on a nice rifle and premium components. Any help would be greatly appreciated!

Regards,

Keenan

 

[704kubotaguy]

Out of about 200 cases of Peterson through my 280ai I had one the other day that would not extract in my Defiance action. I barely tapped the button of the rifle on the floor and it came out. That’s the only one I’ve ran in to out my ackley, my Peterson cases for my .308 and a 7-08 (probably 400+ total across all 3 rifles) that I’ve ever had do this. I cleaned it re-sized it, bumping the should back .003 like I always do and chambered it and same thing. So that needless to say that case went in the garbage.

 

[waspocrew]

I’d try a box or two of different factory ammo to see what happens. Can take some measurements to compare to the Peterson brass as well.

 

[KGLee357]

I found some Nosler factory ammo today and it cycles just fine. Dimensionally it is very different from the Peterson brass. Sounds like I will be looking for a refund!

 

[Sadie]

Shoulder may be pushed to far back not letting the extractor get over the rim.