That is one of the best looking revolvers I've seen in a while. Is the finish on those grips original or have they been redone? In any case, the grips are also beautiful!
Many ask what the best S&W .357 Magnum is and I must admit, the M19 just might be that revolver.
Also, I agree, avoid any bullet that's lighter than 140gr for your M19. The damage done to K frame revolvers was mainly due to super fast 125gr ammo. (145gr Winchester Silvertips are great though lol)