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If shooting 223 in a semi auto rifle, full length size, reload per the book and check every round with a case gauge. Failure to do so is inviting potential for an out of battery fire. I use a Wilson. The case gauge check should be the very last step in your load process before the round goes into the ammo box.

I should add that this is a key safety step when hand loading for any semi auto rifle regardless of caliber. Pistol not so much as pressures are far lower and chambers are more forgiving. Case gauge checks or checking that the pistol round freely drops into the chamber of your pistol barrel (field stripped of course) will improve reliability with your hand loads.

This is not so critical for a bolt action rifle.