Meszaros; I have always felt the 7mm Rem Mag and the 160 grain bullets were a perfect match.
So here is somewhere to go: 160 Partition, start at 62 grains of H4831SC and work up carefully
you should max at 66 or 67 grains.
Or you could try 63 grains of IMR 7828 and work up. Max is about 68-69 grains in most rifles.
These are just a couple of suggestions..
Take care, Eagleye.