First let me state this is JMO.
1. I'm guessing your brass could use some anneling, then trim all to length, camfer inside and out.
2. Make sure everything on the scope is properly torqued.
3. Your rifle should stabilize both the 168's and the 180's, my 7RM shoots the 168's very well. That said I had it specifically built for that bullet it is a 1-10
You might try H1000 I started with R22 after talking with Bryan Litz he suggested H1000 and I've never looked back. Try some different primers, 215m, CCI250, which is what I use I started with the 215's but was always getting one flyer on a suggestion from this sight I tried the 250's problem solved.
4. The bergers like to be seated close to the lands, mine are .001 off, experiment with different seating depths. From a jam out in .010 on out till you find something that is getting close to what you want then tweek from there in.001 increments.
These are the things that worked for me all info gathered here,I am not the most knowledgeable guy on this sight by any means, and still rely on this site and the shooters here for help now and again.
Shot this group last Saturday.
Normally my groups measure around .25 I was just having a very good day. Good luck let us know what you come up with. And yes that is 3 shots,
I had a witness who is a member on this forum.