Hi,
If the revolver is in great shape it shouldn't hurt it at all. I'd save the hot stuff though for a bigger gun.
As already mentioned, standard velocity ammo has gotten the job done in the M36 for years!
If you sleep better at night though wanting +P stuff in the cylinders for self defense, go right ahead.
I've got 158 grain LSWC-HP +P loaded in my '64 M36 (for self defense) . . . but my carry gun, a '71 Model 37 is stoked with 140 grain wadcutters! Talking about going from the sublime to the ridiculous!
Frankly, I've got the +P in the M36 simply because that's what I had handy at the time. I'd be just as happy with any decent ammo that shoots at POA, and will eventually swap out what's in the cylinder . . . I've just got a lot of +P right now.
T.