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Most likely it is not a short chamber but then you would know this if the barrel/bolt combo had been headspaced. I have heard it said on here before that bolts are kept within .001" spec of each other but that is just not so. Also it is as tp555 said that new formed brass from 223 can have a different shoulder than 221 fb and need further sizing. Mine does but new brass will still chamber if I fl size to the shellholder but then again that is my 300/221 reamer and gauge, redding 300/221 v5 dies and shellholder. If you don't get it worked out I can tell you who has headspace gauges in stock ($25) or I can send you new formed brass that chambers in mine.
You could call Redding and ask if your die markings are for a special run or something. Really nice people (607) 753-3331
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