So did you just load all 100 with 47gr and not vary the charge weight? On a bolt gun the lee collet neck die is awesome. Bumps the shoulder back and resizes the neck without beating the rest of your brass up. You have to keep that brass for that specific gun but it greatly lengthens brass life from what everyone says. I haven't shot enough times on any one set of brass yet to wear any of it out on my bolt guns so I cant personally attest to it.
Whats wrong with 3 shot groups? They make me look like a better shooter than I am
I usually get loose printer pockets before I split necks...