I'm in California and measure costs, particularly skilled labor costs, at accentuated values. Too often, putting projects out of reasonable ballpark!
That said, I'm with the vast majority suggesting begin with such as a 300 Mag action. I'll add even though more pricey, with patience possibly just to find a 300 Win Mag with the whole factory 'shebang' done for you. I understand when 'researched' and heart set on particular cartridge. But much to be said re 300 Win Mag considering 100% "factory production" A heavier initial investment, but if 'no substantial alterations and you can live with the factory round, presumably $$$$ saved there. If you change stock, just keep the original! Below mine.
As usual, you pay your money and you take your choice! I'm just a great Occam's Razor advocate!
Best & Good Luck! Hope whatever your decision, your keep your 'public' here informed how it all turns out!
John
