I remember that years ago, one of the gun magazines had a story about a similar occurrence. The rifleman used the his convertible top to steady his rifle for a shot at a distant antelope (I think), with the same results...muzzel blast blew a hole in his rag-top. Likely more expensive than replacing your pop-up blind.
Sometimes you get what you pay for, sometimes you only pay more for what you get.
Three shots are not a "group"...they are a "few".
If the Bible is the literal, infallible, unerring word of God...where are all those witches I am supposed to kill? (Exodus 22:18)