If I remember correctly, back in the day, people were shooting a steady diet of 125 gr. 357 loads a lot thru the S&W Model 19/66 and the Security Six. This seemed to cause frame cutting at the top strap and some cracked forcing cones. Not a problem with heavier bullets, but it caused S&W to come out with the L-Frame 586/686 and Ruger came out with the GP-100. I never saw this problem, but read about it in the rags of the day. The Security Six is still my favorite of Ruger's 357s. They must be held in high regard by a lot of folks out there as is evident by the prices being commanded on GunBroker.
