If it is SAAMI-spec ammo then it will be fine - although it never hurts to check with the maker. The .44 Mag is not like the .45LC, it has one maximum pressure rating rather than two or three. The Contender was designed for .44 Mag pressures, although they are probably on the top end of acceptable.
To assume that the Contender is somehow "stronger" than a revolver would be incorrect. A Ruger Super Redhawk will take higher-pressure .44 Mag loads than the Contender will without damage.
.