Lee Pacesetter Dies and RGB series: Use these dies if you want to produce factory-dimensioned ammo that reliably fits and feeds in any gun. They are the first choice for semi-auto actions. Full-length sizing is a must if you are reloading for more than one firearm or reloading cases that were fired in others firearms. Most Pacesetter dies include the Lee Factory Crimp Die.
The Lee Collet Neck Sizing Dies: Use these dies for best accuracy, longest case life and no resizing lubricant. Only the neck of the case is resized the body is untouched so it retains the perfect fit to your guns chamber. Cases should have been fired in your firearm only and reloaded rounds are intended for use in just one firearm. These dies are the favorite of the benchrest crowd as there is no other die that can produce a more accurate cartridge.
If you intend to reload cases fired in others guns or you are reloading for more than one gun select the Ultimate Rifle Die Set. The Ultimate set includes a full length resizing die that allows you to restore any case to factory original dimensions so that you can fire form in your gun and then reload using the superior Collet neck sizing die. Ultimate Rifle Die Sets include the Factory Crimp Die. The Lee rifle Factory crimp die is the only effective way to crimp bottle neck rifle cartridges. This important step should be performed on all loads used for hunting. Applying a Factory crimp will always improve the utility of the cartridge and in most cases it will also improve the accuracy.
Lee Handgun Dies feature a Carbide Sizing Die. Carbide dies are simply the best way to resize straight walled handgun cartridges.
The Carbide Three Die Set works fine when using a quality controlled source of brass like cases fired only in your gun. More care is required when adjusting the bullet seat and crimp die as seating and crimping occur simultaneously.
Select the Carbide Deluxe Four Die Set when using mixed range brass or brass that was fired in others guns. The Deluxe Set includes the Carbide Factory Crimp Die. This die allows you to separate bullet seating from the crimping operation. It makes setup much easier and the die has the added feature of a carbide resizer that does a finishing sizing pass on the completed round. This final sizing guarantees that any case that passes through the die, will freely and reliably chamber in any gun.