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I have zero doubt that a .357mag loading would get right through the steel

If I couldn't find my preferred ammo I wouldn't lose sleep using regular 158gr JHP/SJHPs

Those do seem to cost way more than I remember.

OTOH, regular plain old 140-158gr JHPs also do well from the .357mag, that isn't something I worry about too much as long as it's a quality brand.
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The Silvertip does rather well in testing from past observation.

I think a .357mag has more than enough velocity to make sure the XTPs expand.