SmallCaliberCentral

i came into possession of a number of .223 bullets. when i checked the diameter of these bullets, the diameter is exactly .223. normally when i buy bullets for my .223, they are advertised at .224 diameter. i checked some of my hornady vmax bullets and some nosler ballistic tip bullets, and they measured .223 1/2. also have some older winchester 46 gr bullets, and they measure .224.
can anyone shed some light on this?
i understand why a bullet is a tad over the caliber of the bore, but why would it be the same as the bore diameter, and will it make a difference?
thoughts?

Is it possible that you got a bunch of bullets that were for the .22 Hornet? Many of the older Hornets were set up for the .223 bullets (vs. the .224s), and that is what you usually see them for.