Ah, yes, the unexpected, unprotected, close proximity, big bore, centerfire explosion, a real eye watering experience. My HS buddy in NH has a brother that tends to learn the hard way. He and his hunting buddy were moving from one place to another "just down the road" during deer season, a while back, so the 270 did not get unloaded. Shortly after the vehicle started moving, there appeared just above the windshield, in the roof, a brand new modification, something like a port hole, except jagged. With the windows rolled up, I understand it was a week or so before either of them could hear again. Thankfully I was not present so I cannot recount the level of the muzzle blast, but needless to say it had to be at the top end of the decibel scale. Now that would be something for a rolling boom box, "crank-em up" contest.
Best,
Ed