I do not have the Hornady data, but my literature shows a minimum of 3.000" OAL. I have also used 3.030". I finally used the longest length OAL that would fit and function in my magazine.
Your load of 38.4 grains of IMR 4350 is well below the suggested start load of 41.0 gr with max of 45.0 gr. With the older mauser action and a short barrel model, you can use 10% below the 45.0 which is 40.5 gr as max. I have no experience with longer military actions and barrels.
Alliant lists data for both modern commercial actions and military actions.