Thread: Winchester X .223 Not very good

My observation is that some commercial ammo suffers badly from the galvanic corrosion between the dissimilar metals in the projectile and brass.

Considering this I would say most are assembled with lube in the necks to avoid this, but some ammo no doubt gets assembled "dry" in the neck area with the potential for galvanic "welding" to take place.

When disassembled by hand the projectile comes out with a loud "crack" as the corrosion lets go, perhaps under the extreme stress of firing this is too much for the time hardened brass to handle and as the corrosion lets go unevenly the neck cracks.