I too suspect it’s the scope from the sudden and dramatic shotgun pattern it’s shooting and your apparently eliminating the other possible causes.
I’ve had a Leopold back in the day that after a controlled fall with me protecting the scope as I was going down shoot a foot to the right at a 100 yds on checking it after missing a big bull at three hundred.
Should it turn out not to be the scopes fault which I think is quite doubtful, it’s never a bad idea to have an extra scope in the safe.
