Hi Rolf, 55 gr and 60 gr decent projectiles with kill roe deer well with lung shots.

I used to use Nosler solid bases in .22 centrefires. For feral goats and similar.

I think you can get .224 Nosler Partition style bullets in Europe. Not sure of the brand? Used some in a Frankinia 5?6x50mm Rimmed and .22 mag U/O double rifle. 55gr partitions.

For foxes I used to use 45 gr Hornady SPs in my .222. To minimise fur damage.

I have been buying loaded 50 gr and 55 gr loaded ammo in recent times. For foxes I would probably look for a 40 gr to 50 gr projectile of fragile construction.

A .22/250 probably will only work with side on head shots if minimising the damage.

Good luck.

Will send a PM.