Firstly, let's get the facts straight. S&Ws, even the K-frame .357 Magnums, are designed to have a long life firing standard SAAMI specification loads. To purposely overcharge them, a la the 'Ruger/TC-only' loads is not advised (Check their manual!). It baffles me that folks always want to 'hot rod' a given caliber - when hotter calibers exist, if really needed.
Secondly, the S&W construction is not just tradition - it's timeless engineering - and strong. The only S&W I recall any history of frame stretching with was the early 29 - and that was a non-issue early in the 29's history. Both the 29's and 629's have had the benefit of endurance enhancements through the years, making current production the best yet. Recall that Ruger uses cast steel, which is cheaper, less dense, and weaker than hammer forged and heat-treated steel.
Let's compare apples to apples - the Ruger KGP-141 GP100 to the S&W #164222 686. Both are SS 4" 6-shot .357 Magnums. The Ruger can be found on page 78-9 and the S&W on page 31 of their respective 2009 catalogs. The massive full-shrouded Ruger weighs 40 oz and sells for merely $680 MSRP, while the liteweight S&W weighs but 39.7 oz while listing for the Kingly sum of $909. The GP100 sure looks heavier, not that a full-lugged S&W, like the usual 686, will ever look 'svelt'.
The K-frame admittedly did not allow a proper sized forcing cone for lite weight, ie, less than 125gr, hyper velocity .357 Magnums. Erosion was such that estimated barrel life's with that steady diet would likely require barrel changes by 40k rounds. That's a box of fifty every week for fifteen years. The increased width (.040") of the front strap of the L-frame permits a larger OD barrel/fc - more meat for the erosion under hyper velocity gas caused loss. The current replacements for the 65/66 .357 Magnums are the 619/620 - actual 7-shot L-frames, but like the 65/66 with their partial lugs.
My migration to revolvers from evil-bottom-feeders was via Ruger, having owned SS, BH, Bisley, Vaquero, SP101, RH, & SRH models, to name a few. I've had calibers from .22 rimfire to .454 Casull. Every Ruger, save that .454 SRH, came home as a 'work in progress', where I had to at the least clean up some poorly reamed holes or rough pawl channels. The 5.5" SS .45 RH had to go back - brand new - for a cylinder, hammer, & trigger - very poor QC. Once working, they were fun - and improveable, trigger-wise. Over-sized cylinder chambers had to be lived with. With my first S&W 9/02, my migration suddenly veered... until I became S&W-only last fall, selling my last Ruger - a MKII - to fund a 617.
The beauty of our fine nation has always been our freedoms. You have the freedom of choice - mine in handguns is clear - S&W revolvers, most with the 'dreaded' IL. You may choose as you wish. Both will go bang for a long time. Should service be required, even a call to Ruger is on your dime. S&W can be reached via an 800 number - and they will send you a pick-up slip for your firearm - and return it to your door, too - gratis. I didn't tighten the rear sight mounting screw on my 6" 629 after replacing my scope & rail recently - and lost said screw. A call to S&W CS yielded a replacement gratis in four days, including the weekend. A similar experience with Ruger required money and a wait.
I seem to fly the S&W standard a lot lately. I just wish I could afford more...
Stainz