I usually test my bullets up and down the velocity scale to be certain I understand what they will do at both maximum velocity and where the bottom is for reliable expansion. Getting into minimum velocities requires either changing powders or shooting at much longer range which makes my chrony nervous. These loads which I have used for some years now are a safe way to hit those bottom end numbers and get a real test of the bullet at a known velocity.
The lightest bullets are a lot of fun in .223 and.243. Those really fragile bullets are useful for small varmints where you want no ricochets and in middle size varmints they almost never exit when they are moving past a given speed for the bullet. That's also handy if you want the hide.
