700 stocks are available in all price ranges from Numrich. Putting a 721 in one is not difficult.

The barrel is plenty thick enough for a 400 Whelen (I did a 300 H&H to 400 H&H).

The only problem with the 400 Whelen was dolts who did not use the Griffin and Howe chamber specs. Get Zeglin's Book Wildcat Cartridges. There is a whole long chapter devoted to the 400 W by the late Mike Petrov. (it's on amazon).

9.3x62 would be my next choice as it treads hard on a 375 H&H.

my 721 300 H&H in a 700 Classic stock.

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Last edited by 7x64FN; 02/28/15.