When you are reloading you should always use a quality lube on your cases. It reduces wear and tear on the dies, the press, and your arms. This is especially important with rifle cases which have a much greater surface area and are prone to get stuck in the die if not properly lubed. That being said sometimes they do get stuck and have to be removed from the die. Thankfully we have a video covering this very issue.
Just in case you are really stuck, or are using non-Dillon dies, you might also need the Redding Stuck Case Removal Kit. Just like our spare parts kits this is a tool you keep around just in case the need arises.