Whenever I've got a new bullet, I will check the load data and then make up some dummy rounds. In your case, start seating at 1.185 and see how the dummy rounds cycle in your gun. Measure the dummy rounds after cycling to make sure they haven't seated deeper. What does the bullet look like seated at 1.185?
What are you gonna do, talk the alien to death? -- (on Sigourney Weaver's worry about Guns in Aliens)
"Safety is something that happens between your ears, not something you hold in your hands."
"I carry a small gun to compensate for my huge Blue press."
Check some more manuals. I find 1.125 OAL listed most often regardless of bullet weight. Depending on specifics I load at 1.12-1.125. For the 40, I like to recommend loading somewhat long to give a little margin of safety for the high pressure round. Realize that every gun-bullet combo is different, so the best OAL for your gun may not be what runs best in one of mine.