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According to The Handloaders Manual of Cartridge Conversions the .30-.338 has a case capacity of 84.41 grains of water compared to 85.78 garins for the .308 Norma Magnum and 90.36 for the .300 WinMag. Any advantage gained by the 6 grains of water difference would be lost by deep seating the bullet.
I have no reason to doubt that this is true. On the other hand though, when loaded to a length that will feed through a standard-length magazine, the 300 Win Mag makes speeds that lie between the 300 H&H and the 300 WBY, both of which require a magnum-length action and magazine. The Win Mag is about 100 fps faster than the H&H, and about 100 fps slower than the WBY. What more could be asked of a cartridge with the overall length of a 30-06?
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Re: Which calibers are easily converted to 300 H&H?