It sizes the outside of the case, de-primes and expands the neck to accept the bullet. The die has vents to prevent case damage caused by trapped air and for excessive lubricant. Headspace is held to minimum tolerances to avoid changing the case body length during full length sizing. The included Seater Die has a built-in roll crimper to secure the bullet at the same time as it's seated.
Standard 7/8-inch-14 thread
The most important link in the reloading process is quality dies. Quality dies give you the accuracy needed for a competitive advantage. For shooters who demand reloads equal to the quality of their guns, choose RCBS dies.