All,
This is an interesting topic.
A couple observations to throw out and questions to ask for the knowledgable folks here about this subject. (Note that for this response, I will think only about no lock revolvers -- the 342 M&P with a lock that is available just doesn't count.)
I don't care much about the ability to shoot .357 out of a lightweight J frame, but there is more than that ...
Right now, with no original 342 being available, the 340 PD is the lightest J frame available. Just over 11 oz, it is only half an ounce heavier than the 10.7 oz original 342 PD. And at least for me, as much as I like my 442 and 642, that is a really noticeable difference.
The 340 M&P sounds great, with its great front sight, lack of any bullet pulling, and no cleaning worries, but it is nearly the weight of my 442/642, so I'm not sure of the value in making the investment vs the 442/642.
I generally use standard pressure fodder in at least my 342, often the 642, and almost always use jacketed stuff, but still, it would be nice not to have to have to think about that potential issue. (Which wise poster in this thread commented that if he wanted to worry what he was feeding it, he'd just carry a semi-auto?) If I knew that there was no bullet pulling in the 340 PD, I might just go ahead and make the investment (despite the price).
I can't tell in this thread -- what are people saying about bullet pulling? Is that an occasional issue with the 340 PD? IE, with any scandium cylinder, or only with the 342? (Especially wondering about 158 grain +P LSWCHP and 158 grain +P Nyclad.)
One more question, in regard to using .38 special in scandium .357 cylinders. Does the added scrubbing that is wise to do in a .357 cylinder fed .38's going to run the danger of harming the cylinder? (Which would be a vote for M&P and 442/642.)
Yeah, a 340 PD without a lock is calling me. Thanks for any input on my ramblings above.
Scott