I vote for the 6mmbr. I just got mine finished a few weeks ago. Wby Vanguard / Howa action. BC stock, Kreiger 1 in 8 twist Varmint , Holland brake, Ken Ferrel 20 moa base, NF rings, 4-14x50 IOR tctical with a MP-8 dot. It will pound 107 SMK's or 87 gr V-maxes into one ragged holes. I have had it out shooting gophers and took a few to 400 with ease. On the way home spotted a yote in a wheat field. 653 yards facing me, dialed up 16.25 and sent a 107 SMK through him long ways..
I probably didnt need the brake, but with it, recoil is ZERO. I watch every hit through the scope even at 25 yards on a gopher.
Lapua brass for $70 / 100 bullets for $25 /100 and 30 gr of Varget or RL 15.
One problem though.... My wife likes it too, she took claim to it last Sat eve as we were shooting steel at 1000 yards. She hit the 2 1/2" orange dot on my target. It took her 3 shots though.... The other two were 4 1/2" off, darn show off..
I love this rifle and wish I would have built one years ago.