A few cylinders of +P are not going to hurt a Model 36. Now, hurting your HAND is another matter entirely!
An extended diet of hot ammo WILL result in shortening the life of the revolver. Acclerated wear on timing components, and you will learn about "end shake" and "cranes".
OTOH, if it stops someone trying to do harm to me and mine, when it is over, I'll have it gold plated, mounted on a plaque, and hang it over the fireplace- right after I buy another.