Apparently, it is. I first called my insurance agency we deal with and have for years. They found an insurer out of NJ after they finally found one. The questionaire was ludicrous. They even went as far as demanding that you cannot do live fire on private property and attest in writing that you will not do so. They basically were telling you how you can run your business. The entire questionaire was as much as intrusive and extremely detailed as it can get. This was for instructor liability. I can only imagine what it would be for a gun shop. I told them what they could do with it, nicely of course.
On the other hand, the NRA questionaire had a few basic questions and the policy terms let you do business any legal way you choose. The rates are reasonable also.