The Lee Precision 257 Roberts & 257 Ackley Improved Collet Neck Sizing Die (part no. 91007) resizes only the neck of fired 257 Roberts & 257 Ackley Improved brass, squeezing it around a mandrel with a collet rather than pushing the case body through a steel die. Because it never touches the case body or shoulder, this die works brass less than a full-length die does, which stretches out case life for reloaders shooting the same rifle they fired the brass in. It also skips case lube entirely: the collet design doesn’t need it, unlike a standard sizing die. Precision handloaders neck-sizing previously fire-formed 257 Roberts & 257 Ackley Improved brass for a bolt gun use this die specifically for that lower-stress resizing step.

Key Specifications

• 257 Roberts & 257 Ackley Improved is the caliber this collet neck die is machined for.
• Neck-only resizing squeezes the case neck around a mandrel without working the case body or shoulder.
• No case lube required is a direct result of the collet design, unlike a standard steel sizing die.
• Extended brass life comes from working the case less than a full-length die does.

Frequently Asked Questions

Does this die resize the full case? No, it’s a neck-only die. It squeezes the case neck around a mandrel and never touches the case body or shoulder.

Do I need case lube with this die? No, the collet design doesn’t require case lube, unlike a standard full-length sizing die.

When should I neck-size instead of full-length size? When reloading brass fired in the same rifle you’ll shoot it in again; neck-sizing works the case less and extends brass life.

Buy the Lee Precision 257 Roberts & 257 Ackley Improved Collet Neck Sizing Die

Order the Lee Precision 257 Roberts & 257 Ackley Improved Collet Neck Sizing Die from our Lubbock, Texas gun shop for fast shipping to your bench. It is a great way to stretch brass life on fire-formed 257 Roberts & 257 Ackley Improved cases, and browse the rest of Lee Precision‘s reloading dies lineup to round out your press setup.