Any modern revolver, and your 25 year old Rossie is considered modern, should be safe with modern +P ammo. I would not make a habit of shooting a lot of it though. My suggestion is shoot normal pressure ammo at the range and carry +P or +P+ for self defense.
Rossi was not made or rated for +P. Standard ammo only
But modern .38 +P will not harm any reasonably well made revolver.
Walklightly said:I carry .357s in my .357 Ruger SP101.