Here is what Lee have to say about the change: https://support.leeprecision.net/en/knowledgebase/article/updated-collet-neck-sizing-dies
Type: Posts; User: caberslash
Here is what Lee have to say about the change: https://support.leeprecision.net/en/knowledgebase/article/updated-collet-neck-sizing-dies
It's actually a good change for 95% of users.
Flaring the case mouth helps with seating any bullet, not just cast ones.
Saves the need to waste time, doing all the neck chamfering.