Why would the BULLETS fall out of the necks??
How much of a flare do you plan on putting on the case mouths? It should be only
just enough to allow the full length of the gas check to sear below the case mouth. The Lee Universal Expander Die is excellent for placing a gentle flare on the case mouths.
Crimp all you want. Unless you are loading an insane load you won't get any appreciable rise in pressure if the bullet is the proper fit.
Which reminds me, what do you plan on for loads?~Muir