E-mailed the folks at Smith and Wesson with the question: Will the 629 handle the 305 gr. Cor Bon Penetrator? Their answer: "Max grain is 250." Are my friends at the factory being just a little conservative? If I buy a new 629 would I be endangering my health and safety by loading a cylinder full of Penetrators? If not, would the 629 shoot loose after a few hundred of these boomers?