Daniel, SA comes in at around 4-5 lbs, and DA close to 12 lbs. Have a great day!

10+ da 4-5 lb single

Daniel, I've been seeing that SA comes in at around 4-5 lbs, and DA close to 12 lbs. Have a great day!

Daniel, recent production Model 66's have an average double action pull of 12lbs and average pull of 4lbs for single action. I have seen some Performance Center Models with a 9lb DA and 2.5lb SA. Cheers and stay safe!

According to "the truth about guns",
"It has a long, but smooth, double action trigger. It’s so long, and, at about 10 pounds, stiff enough that it serves as a safety."
"The single action trigger is entirely different, сock the hammer and you get no take up at all and a trigger pull that can’t be more than 3 pounds. The break is clean, crisp, and light. "
thetruthaboutguns.com/gun-review-smith-wesson-model-66/

Not finding the information posted anywhere even on S&W site. Found a review saying the single action is 4-5 pounds and double action is around 12 pounds. You can always contact Smith and Wesson at 1-800-331-0852 or email them at qa@smith-wesson.com. hope this helps.