I have experienced new cases splitting like that. The cases were made both Bertram and Buffalo Arms. I believe that the cases were not annealed. Since then, Ihave started full length anneaing cases (keeping the heads in 3/8" water) and the issue seems to be resolved.

I had a sling eye separate and the fix was easy. Clean &flux both leaded surfaces, wire the eye in place, and heat the eye.