I’ve done the “half turn” trick in the past - and from a process development process, again, it’s false logic. If it does improve concentricity in a reloading process, then we’d be acknowledging we have eccentric equipment, so the solution shouldn’t be double clutching the ram, it should be to FIX THE ECCENTRIC EQUIPMENT.

When I really care about precision, I seat with a Wilson Chamber seater which holds the bullet concentrically to the body. When I just want to build proper ammo, I don’t bother with tricks, and I accept 1/2-3/4moa precision.