When I went down to 6mm I did not have to trim, only when i went down to 22 X 55 did I have to trim, are you going to go the barrel nut route with your 700, if you are looking for load data just use 6mm-284 and you will be fine, with some load work up you will end up sending 75gr bullets over 4000 fps, heck I have been sending 87gr Vmax's over 3800 fps, so there is your Red Mist effect, I have found that Lapua brass goes well into the 70,000 psi range, before starting to show any signs of pressure, gotta love it.

Dean