Lee Collet Neck Sizing Die, .300 Winchester Magnum

The Lee Collet Neck Sizing Die, .300 Winchester Magnum is a precision neck-sizing die built for handloaders chambering .300 Winchester Magnum who want tighter, straighter case necks (part no. 90961). Lee‘s collet design squeezes a floating mandrel down through the case neck rather than pushing the whole case through a solid sizing bushing, so only the neck itself is resized. That leaves the body and shoulder exactly as fire-formed to your own chamber, which is the entire point of neck-only sizing for a rifle you’re not sharing with other guns. It is sold as a stand-alone die for reloaders adding a dedicated neck step to their .300 Winchester Magnum routine.

Key Specifications

• Uses a collet-and-mandrel mechanism that squeezes the case neck for sizing, rather than pushing the whole case through a solid bushing.
• Sizes the neck only, leaving the fire-formed body and shoulder undisturbed for minimal brass working.
• Reduces bullet runout by keeping the resized neck concentric to the case body.
• Requires no case lubrication, unlike a full-length or body sizing die.
• Dedicated to .300 Winchester Magnum only, a single-caliber die rather than a multi-caliber tool.

Frequently Asked Questions

Does this die resize the entire case? No. It only sizes the neck using the collet-and-mandrel action; the body and shoulder are left as fire-formed, so a separate full-length or body die handles those if you need them.

Do I need to lube cases before running this die? No case lubrication is required for this collet die, since it sizes the neck through mechanical squeezing rather than pushing the case through a sizing bushing.

Buy the Lee Collet Neck Sizing Die, .300 Winchester Magnum

Order the Lee Collet Neck Sizing Die, .300 Winchester Magnum from our Lubbock, Texas gun shop and add a dedicated neck-sizing step to your .300 Winchester Magnum handloads. Browse the rest of our reloading dies lineup for shell holders, seating dies, and the rest of your .300 Winchester Magnum die set.