That's the very reason I haven't bothered to pull the bullets from my Kynoch 404 ammo as I did suspect that the case necks could still split as the bullet is mechanically pulled from the neck. I still have 4 packets of this Kynoch ammo which I won't fire, they'll go with the rifle when I sell it or could be sold individually to collectors. My split repairs work well on the cases that do split at the necks and give long life with cast bullet loads although I would be quite happy using these repaired cases for full power loads too.