I do agree with the many who have cast skepticism on the whole notion that, " SW does not heat treat anything but the M 29...". Just smells fishy from here and seems like one of those stories retold so often that it has become taken as fact. Show me the Brinell or Rockwell numbers first.
I love the 45 LC cartridge but use 44M in an M 629 only because I can do not reload and I can get 44M loads at a pittance compared to the cost of .45 LC. And I do stick to the 240 grain loads by and large.
To the OP, I would say go ahead and shoot the +P loads but with the caution that a shooting 100s of them will wear out your revolver faster than shooting cowboy loads through the the same revolver.
Fun thread.
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