I wish the European Firearms Pass was still available!!
I flew back from Berlin last Sunday. Although I have a FAC, and my host assisted me with the renewal of my Auslander Jagdshein (visitors hunting licence) and a written invitation, the import/export approval process in Germany for individuals from a 3rd country (non-German and non-EU) weapons changed recently. I did not take my rifle and borrowed an estate rifle. In years gone by I would send a completed "Antrag auf Erteilung einer Mitnahmeerlaubnis" and pay a small fee to local police firearm's team. This form lasted for 12 months but was limited to the number of border entries (e.g. 1, 2, 3 or more).
This appears to be no longer the case. The change in law/process is not well documented (or at least I have not found information online). With the assistance of my German hosts, it appears that the Customs side is now handled by German Customs (
www.zoll.de) and there is an online form to complete (it appears to replace the old Antrag referenced in a post above).
In my case, I fly in and out of Berlin - see links below which are available in English and German. I did not actually apply as I ran out of time trying to work things out but did dry run the form to understand what was required. It is very similar to the Antrag. The new form (accessible for Berlin entry in the 3rd link below) requires you to transcribe line entries from your FAC corresponding to the firearms you are taking and to provide a Berlin address. The form has 3 variants (import, export or transit). I think you need to complete the transit version. It is a one-time entry form for specified dates and does not appear to cover multiple entries. There is a file upload facility to upload copies of your passport, FAC, invitation, Auslander Jagdshein etc. In relation to ammunition, officially they only accept boxed factory ammo (i.e. CIP certified). It appears that the processing fee is ca €50 from memory. FYI the import/export certificate is insufficient to purchase ammo in Germany - so take what you need or ask your host to purchase.
https://www.zoll.de/EN/Businesses/Movement-of-goods/Import/Restrictions/Goods/Weapons-and-explosive-substances/Weapons-and-ammunition/weapons-and-ammunition.html
Weapons and ammunition - Competent authorities in terms of weapons legislation
Weapons legislation – Applying for a relocation permit - Services - Service Berlin - Berlin.de
While this change is frustrating for lack of a FAQ, my last experience with a weapon could not have been easier. The customs police were friendly, fast and efficient. I may fully dry the approval process to better understand what further requests are made by Zoll/Berlin police.
I have no idea what you need to do if your entry port is not Berlin....for what it is worth the information requirements are not dissimilar to what the UK expects from visitors with firearms. Hope this is helpful...