You probably would want to start with the mid range powders..
2400,Reloader 7,4198,4227..then move on to the slower powders..H4985,AA4064,4320,Varget, 4350...
2400,Reloader 7 are my favorites in the faster powders.
H4895,AA4064 and Varget turn in some impressive groups..
With the right bullets the slower powders will work with weights of from 155 to over 200 grain...
I'd you have or can get some the 311299 with a starting load of 29 grs of H4895, AA4064 or Varget are tack drivers. ..ditto for the 311284 ,311290
Start with 27 grs with your 170 grain bullet and work up in .5 grain increments. ...
Although not very economical the Lee 155 312 ..shoots very well with 30 grains of H4895..haven't tried anything lower 'cause I use it in my M1 Garand. .