A sizing die that will not size to SAAMI specs is defective. Did you contact Lyman?

Never heard of a die that produces cases with excess headspace. Is this a feature of these dies done for a special purpose?

Far and away, 99% of the problems new reloaders to 223 have is not sizing the case enough, and result in failure of the bolt to go completely into battery on loading. What can be made to work in a bolt gun simply won't work in an AR.