You will likely have to buy a rifle, and break it for the action. Selling the unwanted parts from the rifle and your action willl offset the cost somewhat.
Would a stainless rem 700 sps be the best way to go?
What I've done a few times is buy an SPS stainless and repolish it, then beadblast it with the barrel and it all matches. The SPS action is no different than any other 700..they just don't spend time polishing and they use a coarse beadblast to remove the machining marks.
tip:...buy one in 300 Win Mag,..you'll get more for the barrel than a 7 Mag barrel.
Put the thing together on the chrome moly action and spend the funds on having the whole thing cerakoted "titanium". Looks sharp.
Otherwise I would do what Rembo said.
Just build it on the action you have...



























