Yes, BUT---The barrels are not the only consideration. Please have a SxS gunsmith that knows what he is doing pass judgment on the whole gun.
Even in the most extreme case, a gun that was proved for black powder , if in good condition, can shoot 5000 PSI Nitro loads and most up to 8000/9000 PSI.
This precludes any run of the mill Saami shells.
Hope this is helpful.
Best,
John

Humble member of the League of Extraodinary Gentlemen (LEG). Joined 14 March, 2006. Member #1.