Node
In load development, a velocity plateau where the rifle groups particularly well across a small spread of charge weights.
A node is what you’re looking for during a load ladder. On the velocity-vs-charge plot it shows up as a flat stretch. Adding a tenth of a grain to the charge moves velocity less than expected.
Sit your charge in the middle of the node, not the edges. That gives the load room to drift up and down with temperature, lot variation, and the long tail of life happening without your accuracy collapsing.