Varget is too fast for a magnum. You might be able to get by with the H4350, but for sure you can use H1000. RL22 or H4831SC seem to be the most popular powders for the 7mags. I use 4831SC myself on a 7WSM.
If you contact Berger, they will provide you some data with that bullet.
Hodgdon has data on their website for most of their powders, for the 162 A-Max and the 170 Gr. Sierra. Doesn't take much interpolation to gin up a starting load and work up loads for a 168 gr bullet. Note: Hodgdon published Max loads for the 7mm Rem Mag are on the light side, but still work up from below.
72gr of H1000 in my eyes is a bit heavy. with 168 SMK's i run 67.5gr of H1000 or 65gr of RL 22 in my 7 WSM with a 28" 1:9.5 twist, My good friend shoots a normal 7mag and tried to use my data to work up his load and ended up turning the load wayyyy down
Big question is whats the barrel info? the long 284 bullets, bergers especially run right at the edge when stability comes into play, dont try to slam the load as fast as you can, i found the large case 7's to shoot much better when you give em some breathing room. I'll try to get the load info and PM ya later tonight with it