338 for sure. Why don't you like the 264?
Here is my 338 Wildcat
338 Gaillard is my long range beauty. 416 Rem Mag Parent case FF, 38 degree shoulder & 10 Thousandths case taper, 215F Match Primer, 91gr RL25, 250gr Sierra HPBT or GK, with a MV of 3070 FPS will put the hurt on anything.