Final answer:
The final step in selecting the right ammo involves matching the ammunition with the firearm's specifications and intended use, which includes checking the caliber, bullet weight, and bullet type.
Step-by-step explanation:
The final step to selecting the right ammo in a barrel to box process is ensuring that the ammunition matches the firearm's specifications and intended use. This involves checking the caliber, bullet weight, bullet type, and the purpose of the ammo, be it for target shooting, hunting, or self-defense. It's crucial to use the proper ammunition as using incorrect or incompatible ammo can be dangerous and can damage the firearm.