You should cut out the crimp in military 223 brass. If you were attempting to prime 7.62/30-06 military you would never have gotten a primer in if you had not removed the crimp.
I used to cut out the primer crimp in 223 brass with the spay blade in a Stockman pocket knife. Does not take much material removal in 223. The fastest way is using a Dillion "Super Swager"
http://www.dillonprecision.com/conte...uper_Swage_600. I can swage a case in less than five seconds on a continuous run.
I have swaged five gallon buckets of brass with the Super Swager and the cost is well worth the reduction of time.
Always remove the little brass donuts that result from swaging. Donuts can fall into the primer pocket and one gentleman did not remove them, primed right on top, resulting in a high primer with a seated anvil. When he shot them in a semi automatic mechanism the primers slamfired!