I think you need some sort of hair shirt discipline to encourage you to be more attentive while loading.
But the difference between standard and magnum primer is not going to blow up your gun unless you are very overloaded to start with.
That said, 4.4 grains HP38 is already at or over the maximum book load for 125 grain lead 9mms. I'd go back to about 4 grains and shoot.
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