Do you know if your primary extraction is good ? With the bolt closed if you look at the back of the bolt near where the handle is there is a collar with a cam shaped feature in it. If you cock the striker by raising the bolt, then lowering it again (so that the bolt lift will be light) as you raise the bolt handle you will see that the clearance between the receiver and this collar gets smaller and smaller and eventually they touch and force the bolt rearward. If the gap in that location is too great, you may get very little benefit from the cam feature which will make it very difficult to get fired brass out the chamber.
It doesn't help if ammunition is dirty. You might ask your friends who reload if they have a vibratory bowl type tumbler in which case you could run the live ammo through it and it will clean up nicely. The dirtier it is, the longer this will take. After you try a batch, you might want to get your own one to clean your stash.
To prevent this from happening again, consider vacuum packing it after it is cleaned. Any vacuum packing machine of the type used for steak and sausage will do. Get the narrowest roll material you can find since you ideally want small handy packages that hold 20-40 rounds max.
Links often cause some bimetallic corrosion where they touch the brass. Depending on how bad it is you may want a polishing wheel on a dremel but don't get it hot. Any time you have linked ammo and no machine gun, get the brass out the links ASAP. Otherwise its just more trouble later.
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