I have put my Brno 602 action into a Bell and Carlson CZ550 magnum stock.
It fit straight in and screwed up out of the box, but i had a gunsmith do a final fit and finish. The action screw holes were ever so slightly off and was worried the action would bare up against the action screw under recoil and wasn't sure on the recoil lug contact. Gunsmith relieved the rear of the stock and made sure the action bedded properly on the front lug. He remarked that it was an easy fit up and was very pleased with the stock and fit, as am I.