It's the European 270 or 30-06 ie ubiquitous.
Try the 139gr interbond which has a BC of around 0.5 opens well but retains weight.
Myself I use a 7x57 which with 50gr of H4350 yields 2,900fps for this bullet. Very flat shooting. A 7x64 with 26" barrel should manage 3,100-3,150fps. Lots of quality brass (Norma, RWS amongst others)Never a military round so can be used in France (which is why it's so popular)