For the past few years, I have flown to Sweden (several times a year) with a hunting firearm. Each year I apply for and receive a permit from the Swedish Police to temporarily import a firearm and ammunition. I have an EU Firearms Passport.
It used to be really convenient to take the direct flight out of Birmingham to Landvetter, Göteborg. This year, the flight was moved to Heathrow. I was told when I checked in a week or so ago that at the end of October, the flight will be moved to Stansted which is probably a four hour drive with the kids barring delays.
I could fly KLM from BHX and transit Amsterdam. I need to know if I need an additional permit from the Dutch authorities. I spoke to the airline who, to be honest, had no idea. The guy after lots of checking eventually said I did, but he wasn't sure. KLM's own website says that EU passport and firearms passport holders do not need to apply for a "Consent for weapons and ammunition", but I have been in an airport before when no-one had a clue and it isn't fun.
So, I could do with hearing from anyone who has travelled within the EU and transited the Nederlands. If this isn't favourable, then I could fly via Germany and the same question stands. I believe that the EU firearms pass is all that is required to transit Germany, but I would rather hear from someone who has actually tested the theory.