Hopefully someone with actual 7WSM data will reply but in the mean time, reloaders nest has a few loads for the Berger180
7mm WSM @ www.reloadersnest.com
I don't have a 7 WSM but I do have a 300 WSM
and RL17 pushed 180 E-Tips @ 3190 out of my rifle with a 24 3/8ths barrel.
RL17 might be a bit fast for the 180's out of a 7 WSM, but it might be worth trying. it has a burn rate very similar to H4350, maybe just a little slower. Hodgdon is showing a starting load of 49 gr of H4350 for a 175 bullet.
Cartridge Loads - Hodgdon Reloading Data Center - data.hodgdon.com
Hodgdon's new Super Performance powder might also be a good candidate.
Hope that helps.