I'm going to order up a McMillan HTG stock. I will not be hunting with this rifle. I am leaning towards putting an SPS tactical in it. I know I want forest camo and inlet for a RH SA R700 with Williams bottom metal. I don't know what to do about the other options. What do you all recommend as far as the fill material? How about the size of the barrel channel? I'll be using a factory Remingtion HB right off but would like to be able to put a little thicker contour BBL in it after the fact. Of course I don't want to open up the barrel channel to the point that it looks goofy with the Remingtion HB. Lastly, how about the pillar installation? Is this something I should order up? Thanks a lot!