Our most accurate book load for the 7mm STW with the 7mm-160gr AccuBond is as follows:
H1000 powder
Start : 74.0grs (most accurate)
Max : 78.0grs
As always start low and work your way up carefully.
In my 7STW with the 160gr AccuBond I had excellent results with 80gr of H1000. I had the same level of accuracy with 80gr of Retumbo and, presumably, had a lower pressure load.
As always ,you need to start with reduced loads and work up.
I'm at 78 grs of RL25 with excellent accuracy--probably about 3,200fps MV. While not exactly the most demanding test for the load, it performed flawlessly on a broadside antelope shot at 160 yds so far this season.
Charlie-NY has more experience with this cartridge than I do. I plan to load some H1000 this weekend for a comparison but will hunt deer and elk this year with the Reloder.