They have been making the remingtons for a while now, I don't believe, they are making SA magnums actions yet. this is my thoughts on it:
A remington action can be had for 530 dollars, it will require at least 200 dollars in work to get it near the level of the Tikka. It doesn't include a rail, which, good ones are over 100 bucks.
A Mack Bros stainless stell action, with a pinned recoil lug and 20 moa base is 750, though the website apparently reflects less than that.
The Mack Brothers EVO II Stainless Steel Short Action starts from a 416 heat treated billet, and is CNC machined in only two operations eliminating possible
macbros.com
They are out of stock right now, but they are far superior to the Remington action and do not require any additional work.
There are also Zermatt arms bighorn action, which runs about 900 or so.
If you have an itch that needs to scratched now, get the Tikka.