Nice Looking Gun, And Groups look nice and tight too, you might can get some even tighter groups, with Hornady A-MAX 168grain Ammo thats what I been using in my LTR Tactical, but I dunno cause your groups look pretty darn good. As Far as your stock goes what a kind are you wanting to replace yours with? I believe the H&S Precison Stock that comes on the LTR's and 700P's would work for you. There is a link in the (MY 700) page (listed Below) on here that a guy had an sps tactical and put the H&S Precision on. I know your not looking for info on the SPS tactical but this link might be usuful to you.
http://www.700rifle.com/forums/viewtopic.php?id=251
http://www.700rifle.com/forums/viewtopic.php?id=251