I recently purchased a S&W model 686 revolver. Last week I purchased some Winchester 110 gn 357 mag ammo and shot about 14 rounds. Later on while reading through the instruction manual that came with the 686, I noticed on page 12 it stated "caution: do not use magnum loadings with bullet weights of less than 120 grains. This will reduce the possibility of premature erosion in titaniaum alloy cylinders". Wanting to be cautious, I sent off an e mail to S&W customer service asking if this applied to my 686. However, after sending the e mail, I realized that the information on that page of the manual pertains to Ti, Sc & PD series revolvers which I don't believe applies to the 686. I felt that I made a mistake sending that e mail. However, even though I clearly stated in the e mail that this is a model 686, the S&W support agent replied back "Dear Customer, This ammo will void your warranty. If further assistance is required please reply accordingly." I replied back with a clarification e mail but have not received a response yet. My question is will this ammo harm the stainless steel cylinder of the 686 or did the S&W support agent not read the part where I stated that it was a 686? Any comments will be appreciated.