Since September 11th, it appears to be difficult, in europe, to find high quality ammos imported from USA, as, for instance Federal Premium in 375 HH.
However, it's possible to buy HH 375 Magnum ammos in 270 and 300 gr, solid and soft nosed, at the HH store in Paris.
Has anybody experience with those cartridges?

No. But last I heard, H&H had never made any ammo themselves. So I'd guess someone else is making the stuff for them. So the quality would be very dependent on who's making it for them.

Frog, I would suspect the ammo is made by Kynoch for H&H, but it could also be from Wolfgang Romey in Germany. I looked at H&H's site, but they did not have any ammo listed. Kynamco(Kynoch) does have an agent in Paris and their ammo is first rate. I understand they use Woodleigh bullets in many of their big bore loads. Do a search for Kynamco and check them out.

I think most of H&H ammo is made by Norma in Sweden.

We have used a number of different caliber loadings with their headstamp, and had no problem whatsoever.

Saeed i think you have right there, Norma has made ammo for Vom Hofe, RWS, Weatherby, Dakota, Nosler, Browning, some for Lapua and many others.

So their ammo is good qulaity and available in many places, however its pricey, i saw some Swift A-frame loads 300 grs loads, they cost 200 dollars for a 20 pack.....

Holland have most of their proiprietary rounds made for them by wolfgang Romey, this uses Horneber brass and in the main Woodleigh bullets, the boxes are made in hollanmd's own green/ beige livery but a quick check on the headstamp will usually reveal the Romey tradenmark Pentagon shape.

Usually they will also (in London at least) offer other makes of ammo, in the past I have bought Federal ammo from Bruton street, but the current own brand they offer is from Romey

I did not have any problem to supply US made .375 HH.