I used this die to reload for a new glock 357 sig. I have ran 1000 rounds through it so far. The machining was really rough so I used some Mother's metal polish and polished everything up to remove the burs of metal left by the factor etc. This die works great when used in conjunction with the Lee 3 die set. You might want to use your .40 S&W carbide die to full length resize before using the lee dies to neck size. I just barely flare the neck to fit the bullet. That way there is plenty of neck tension. Finally set the crimp die to a moderate-light crimp and you have plenty of neck tension to hold the bullet. These dies are a great choice over the RCBS.
Pros: A lot less expensive than the competition
Cons: machining is rough...
Would recommend: Yes
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