Wow!! I'm surprised on so many levels but kudos to you on manning up to a MAJOR mistake on your part. Your not the only one who's had a moment as I know I have!

As for the damage to the can, who knows, there may be structural damage internally that you can't see but for someone to fire multiple rounds through a can like you did, I'd sure like to know what brand it is because its VERY WELL built!!! Lots of cans it only takes one baffle strike and ugly things happen!
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Been there, done that many times and have the DD214 to prove it....