Yes, the Lee Factory Crimp Die is just for crimping. Does a excellent job crimping. The other reloaders are right also, you can neck size only if you use the same brass in the same gun...I suggest to start with new brass also. Varget is a excellent powder.
I crimp all my Auto/lever rifles and pistols, the Lee Factory Crimp does a excellent crimp, you can adjust it to the amount of crimp you need. For my Bench a must have die.
26.5- H4895- 55 Rem PLHP WW cases BR-4 Primer
Remington Power-Lokt 55 2.260" COL- Reloder 10x 24.8 - WW cases-CCI BR-4 Primer