Just as a point of reference, my pro was exactly like yours, shooting off a sandbag the gun is 5.5-6" low at 30 feet.
As referenced over and over, dawson...
I recently had a round with an inexcusably high primer that I didn't notice and loaded happily. The slide was just barely out of battery but the striker fell and put a tiny dent in the primer.
I think I very narrowly escaped a kaboom.
Perhaps this happened here and you were not as fortunate as I was.