What is the process of backing off the ram slightly and screwing in the die an additional 1/8- to ¼-turn called?

The process described involves adjusting the position of a die in relation to the ram to achieve the proper amount of cam-over. Cam-over is a specific adjustment technique used in reloading, where the die is turned in slightly to ensure that the desired pressure and alignment are achieved when the ram is cycled. This slight adjustment helps in accommodating variations in case length or bullet seating depth, ensuring consistent and precise reloading.

In this context, backing off the ram slightly and screwing in the die by a small increment allows for fine adjustments to be made, contributing to the overall functionality and reliability of the reloading process. It serves to enhance accuracy by allowing reloaders to achieve the correct preload on the bullet or case, ultimately affecting performance during firing.

The other choices, while related to the reloading process, do not specifically refer to this action of adjusting the die for precision. Locking usually refers to securing the die in place after adjustments have been made. Resetting implies returning to a standard or original position, which doesn’t specifically capture the nuanced adjustment process indicated. Fine-tuning suggests refining or adjusting settings but does not explicitly connect to the specific mechanical adjustment known as cam-over.