I've been away from the "legalities" of the SDA for a while, but I don't think that anything above 45 caliber (including the .454) is legal.
Now, with regards to the "permitless" carry, I'm not sure I would want to test the law. My last name is not "Harper."
Now, with regards to the "permitless" carry, I'm not sure I would want to test the law. My last name is not "Harper."