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Originally Posted by CrustyFN
With both die sets you can crimp with the seating die. The four die set gives you the option to seat and crimp separate.
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The Lee four-die set also includes another function, completely unrelated to separating the seating and crimping. It sizes the finished round (post-sizing because it is done after everything else has been done) to make certain the cartridge is within SAAMI specs (that is, the case has not been bulged by having an oversized bullet squished into it).
Added by edit: If your rounds are not out of spec, the post-sizing ring does nothing, not even touch the cartridge. Thanks, CrustyFN, post #13.
If you don't want that function, there are five solutions.
Have Lee ream the sizing ring larger.
Knock the ring out of the die
Purchase another brand of dedicated crimp die
Seat your die with the seat crimp die adjusted to apply no crimp and then crimp with the same die, adjusted to apply no seating.
Buy an extra seat/crimp die. Seat with one seat/crimp die and then crimp with the other seat/crimp die. This last solution is super cheap if you can find a tool steel 3-die set because you can usually get the tool steel set SUPER cheap. The only difference between a tool steel die set and a Tungsten-Carbide set is the #1 (sizing) die. The other two dies are the same.
So simple. So easy.
Lost Sheep