If you're using full-length size dies you're probably on the ragged edge of chambering and risking a slam-fire.
Why?
The bolt carrier group is stripping/feeding, loading, chambering, and locking a round by force -- the inertia of the bolt carrier group and buffer slamming that sucker home.
You're having to mortar an un-fired round out because it was jammed in there. If it wasn't for the drag on the cartridges from the feed lips and magazine spring from the bottom, an inertia firing pin can set the round off if it's got enough running speed once the bolt locks.
Happened to me during standing practice at Quantico. Replaced my Dillon die with an RCBS Small Base in 2000.
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