Regarding factory ammo, yup. With every new firearm I always start with factory ammo and chrono the good stuff to get a benchmark of performance and velocity. I'm attaching a copy of my log which documents most of the results from the trips to the range with the Labradar including the factory loads. I know there are some data junkies out there so it also shows the effect on temperature and velocity.
I use QuickLoad to help with the initial process of finding the alleged optimal load, not perfect but helps give a recommendation and shorten the process. For my 18" barrel the Optimum Barrel Time is Node #5 at .9245. Based on that formula optimal velocity at 35 degrees should be 2,726 fps. Attaching a screen shot for those that aren't familiar.