Lee Micrometer Full Length Dies: 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. The Lee 308 Winchester Micrometer Full Length 2-Die Set includes Full Length Sizing Die, Micrometer Bullet Seating Die, Universal Shell Holder, Powder Dipper and instructions with load data. Select this die set if you are reloading new or mixed range brass. If you will be reloading for hunting, or your firearm magazine limits the overall length and prevents your bullet from touching the rifling, Lee recommends restoring accuracy with the accessory Lee Factory Crimp Die.