It is a sad fact that in order to possess expanding ammunition for your 375 H&H in this country you will have to have it conditioned for shooting deer or Boar, fact. No amount of begging or pleading will change that unless your constabulary are willing to break from home office guidance, good luck on that one. Solids are a completely different kettle of fish and they should allow that for you to at least become aquatinted with your firearm before travelling, the only question then is where to have a play so to speak - one of the reasons that I built my range was to allow holders of heavy calibre's to do just that.
Many constabularies are aware of the poorly worded guidance but must adhere to it and getting them to condition a 375 for deer can be asking too much especially when you may have other calibres that are deer legal already. It is an often unknown fact that prior to the last firearms atrocity, a number of small changes to the guidance were being considered, one of them being the possession of expanding ammunition for zeroing with large calibres without the need for them to be conditioned for game in this country which would have solved much of the problem - unfortunately due to the uproar after the incident, all proposed amendments were dropped leaving us as we are now. As some of you may remember, when questioned, David Cameron was adamant that there would be no changes to the firearms licensing procedures, he was telling the truth.
HME
To be fair though, if you already have an open ticket, and suitable land appropriate for such calibres, then the fact you have been granted the calibre for use overseas, fulfils the HO guidelines. As far as I'm aware, they don't check that you have been and taken said firearm on a hunting trip, so, once you have justified ownership, that is the time you request open usage in the UK.
That is what I did, and yes, I had to convince them that I wasn't just shooting on the flat lands of the east, and that I had opportunities for its use in more mountainous environments (I know this isn't in the HO guidelines, but you can see how they are thinking). And low and behold, as with others I have a fully serviceable rifle conditioned for AOLQ which I use regularly for deer. I can zero without issue, I can own 250 rounds (not that I can afford to buy that many at a time).
Now I may have a tough time justifying keeping it at renewal if I haven't got some evidence of use overseas, or if my permissions have diminished or I have moved and changed forces, but for the time being, the system has worked.
What has been said by others, which I feel is a routinely made mistake by many, is that people frequently ask
if we can have something, rather than telling the police what we want and why we want it. And a lot of people have p[iss poor reasoning for what they ask for, and no argument to back it up, so you can't blame the system for seeing through this sometimes.