I've ran pressure up to visible signs with a number of bullet/powder combinations.

With Win brass I usually see primer flattening, and ejector marks where pressure calcs at about 65K via Quickload pressure/velocity correlations.

With RL17, I'm getting velocity that correlates to 70-72K pressure, but without any signs. In fact the signs point to normal to low pressure.

RL17 with it's retarded and flattened pressure peak allows the bullet a little more of a running start before pressure peaks. This reduction of inertia, along with a longer "push" at peak pressure is part of the equation, IMHO.