I'm building a 260, so more or less the same thing. My goal wasn't 10 lb, but I didn't want a 17# beast, either.
10 lb with scope is certainly doable. Here's how I'd do it:
- Surgeon 1086 - ~2.5 lb
- #3 22" barrel - 3.4 lb
- EDGE stock w/ ADL magazine - 1.4 lb
- Leupold Mark 4 3.5-14 - 1.4 lb (NF 2.5-10x32 is even less if 10x is enough)
- Seekins or other aluminum rings
- Rem or Jewell trigger
So you're at 8.7 lb before rings and trigger (and ammo of course). You could save a little weight by going with 260 in a short action, fluting the barrel... Maybe even go with something other than a Surgeon and use a 2 piece base or Talley rings. I don't know how much you'd save, but that solid 20 MOA rail can't be light.