per post #11;
Minimum loads cane be dangerous too.............
mostly in rifle loads, no matter what primer, if the volume is around 50% or less.

The primer goes off and if the load is level, it will light off the total top part
of the powder in the case..........
instead of lighting the bottom of the powder and working forward.

The large surface area can cause a Detonation faster than normal and raise
pressures in rifles and pistol loads, enough, to damage a weapon.

One reason a minimum starting load is listed with all powders as well as maximum loads.

Below starting loads and compressed loads with Ball powders can lead to big problems.
Follow the data closely.