See if you can locate an A-Square based on the 1917 Enfield action. These are extremely ugly and rather heavy but they are designed to minimize recoil in any of the calibres they are available in. Alternatively there is a sort of piston arrangement where the back end of the buttstock slides forward, I don't know who makes them but they do work. Short of all those suggestions, you might emulate Bell with a 6.5x54 Mannlicher, take only standing shots and practice an awful lot.
