I like to FL size cause I got alot of guns and some same caliber.

If you got a somefire formed brass, and you know its for your gun, then sure neck size with a collet die.

Case head seperation is usually a result of improper head space or miss adjusted sizing dies. Most problems with case length growing to excess is caused from draging the expander button thru the case neck during the resizing operation! The other leading cause is loading to excessively high pressure. The best cure I've found is to use the Lee collet die. This eliminates the problems of lubing the cases and also doesn't stretch the brass. Another benifit seems to be smaller groups. A win-win situation! If you are having case head seperation within 3-4 loadings you have a very real problem, and shouldn't shoot that rifle until you have it checked by a compitent gunsmith.

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I said, "I have seen the begining of head case seperation as early as the third firing" (using a dial indicator which measures on thousands of an inch). Good luck.

One thing that I havent seen mentioned in this thread is the need for full length resizing for a semi automatic rifle.

Neck sizers are fine for bolt actions that have the camming action to help them fit in the chamber, but if you are using a semi auto like a Remington 7400 or a Browning BAR, if the cases arent full length resized then they arent going to chamber at all.

Its true that a fired case that expands to the same dimensions as the chamber will be more accurate than one that must expand to the chamber but this only works for the bolt actions.

My 7400 30-06 wont even think about chambering a round unless its been full length resized. For my bolt actions, I can get away with neck sizing only and it works well.