This ones not a reloading issue rather a deliberate, even if, in the end, unintended, bore obstruction.
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I’ll give the fellow the benefit of doubt that he didn’t leave it in there because he thought it would be OK.
yeah, I saw those two pictures too...and a third one that showed the bloodied shooter being stretchered into an ambulance. Thought I'd never see it again, but I did. At least this one didn't get hurt so bad.
My wife's nephew (who lives in a little Colorado ranching community) sent a Remington 700 chambered in 7mm Magnum to me, and asked me to take it to a local gunsmith to see if he could rebarrel it. It looked exactly like the picture you posted....banana peeled barrel....and caused by the exact same bore obstruction....a laser bore sight. He said his son was sighting in a new 4-12 power scope, and forgot the bore sight was still inserted. It was factory ammo, as he doesn't reload.
The Gunsmith took pictures of it (I didn't, but wish I did). Then he told me, "No way in hell, would he rebarrel it." Said the receiver most probably had hairline cracks not visible without a microscope, and he didn't want anything to do with it.
So I sent it back to him, and he said he was going to display it on the mantel. I think he took it to a land fill.....what a waste.
I also saw the episode of "MythBusters" based on the same pictures you just posted, where they said that couldn't happen with just a laser bore sight.....maybe maybe not.
Most probably that depends on the caliber. At least one high pressure magnum certainly did. Don't remember what caliber the one in your picture was...do you know?