"Keep in mind that the K-frame was never meant to be a full-time .357"
Just out of curiosity, because I keep seeing this repeated on the forum, where is this documented?
Back in the late '50s and '60s when most people understood and accepted simple concepts when someone with superior knowledge gave them proper instructions, a piece of paper wasn't needed to satisfy every cry baby that came along, and his lawyer, so I doubt there is anything official, from S&W, in the way of documentation. Remember, too, that the 125-grain ammunition that is the locus of this controversy was not, to my knowledge, even being offered. When I was a lad growing up around older shooters, the idea of using something as light as a 125-grain bullet in a .357 Magnum would have been considered ridiculous, a stunt.
But everyone knew the score on the Model 19. It was what it was, and it was the gold standard against which every police-type revolver was compared for about two decades. Times and policies may change, but the K-frame .357 is still just as good as it ever was (later versions probably better) when used as intended. The history and the facts are there. No pieces of paper needed.
Getting back to the OP's tropic, Squidsix has a good point.

One would think Silvertips should be easier on the gun than 125s, but there is probably no proof of that. In my own case, I have used them almost since the day they came out, in what limited quantity I could justify, and I still do use them in preference to anything else. I'm sure my first Model 19 probably has 2000 or 3000 of them down the pipe, which is not a lot by today's standards, but the gun is still just fine.
The single most important thing to consider, IMHO, is keeping the gun clean and properly adjusted. When the 19 ruled the roost, most of us never fired 200-300 rounds in an afternoon, without cleaning, as some expect to do today. The gun might have been fired 25-50 rounds, cleaned, inspected, and set aside for the next time, or returned to duty, as the case may be. When it needed maintenance, it got it. A finely made revolver was not allowed to beat itself to death for no good reason. Only an oaf allowed his investment to deteriorate by not properly caring for his revolver, and in those days failures of the Model 19 were so rare they were sensational. I never saw a cracked forcing cone on a Model 19 until just a few years ago, and when I did (predictably) the gun was absolutely filthy.