Standard Lee collet die works great, but you can only neck size a AI fire formed case. You will probably need to bump the shoulder back at some point which requires an AI die. I also buy the Lee AI die sets when that happens.
However, you might be able to get away with the standard die set for many, many reloadings though.
Edit - And the 2nd best thing about the Lee collet die is no lube required! Really speeds up reloading process and increases accuracy when you are loading for a bolt gun where you don't need to FL resize very often.
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