Can't imagine what is going on with those cases.
I've used nickel plated cases in many pistol calibers over and over, so many times I've lost count.
For 45acp, generally a 200 grain swc at at least 850f/s.
Not real hot, but not light, either.
No problem.
Are yours splitting at the mouth?
If so, maybe you're working the cases too much somehow, like over flaring and then having to do a lot of crimping.
Just a guess, though.
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