Am surprised as that has not been my experience with both 3 1.0s and 1 2.0 M&Ps.
Why not take a fired case, resize just enough to snugly hold the bullet you are using for reloads, and insert into barrel (out of the slide) till the base is flush with hood of barrel, barrel point up. Push out round and measure. If grossly short, consider using a different profile bullet or reaming chamber. Nitrided barrel is really hard but Memphis Mechanic on this site has done this for members in past.
Mark