What caused this to happen?

[CINDERS]

hhmmmm wonder who that bower bird would be........................!

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[garra]

I have seen that bulging before. Happened when i reloaded some 44 mag rounds, but didn't have a box to put the reloaded cartridges in, so I used a 45 colt box. Went out shooting months later with the 45 and couldn't hit anything, pulled bulged and split cases from the cylinder and realized what I had done.