Don't blame it on the bullets.
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<br>Your loads were already dangerously close to the edge. When you changed one variable (those bullets), the slight difference -- which wouldn't be a great problem if your loads were safely moderate -- was enough to hoist pressures the small amount necessary to expedite the destruction of your rifle.
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<br>I'd need all the details of your load, to be more certain and specific, and I'd really love to run one of your loads through an instrumented test barrel -- but given what you've told me, I'm confident that your loads were already hot enough to have you skirting close to the brink of a blow-up.
