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I just got off the phone with Redding. I was asking them whether or not it was possible to ream out the neck on the sliding sleeve of their 6BR competition style dies to make a set of 30BR dies.
Learned a couple of interesting facts. Firstly, as I suspected, the inner sleeve in these dies is not hardened because it is not required to perform any resizing on the case. They advised me that is is therefore possible to ream out the neck to 30 cal without damaging your tools.
Secondly, they told me that the 7BR neck sizing competition die actually has enough clearance to pass a 30cal neck so you just need to change the bushing and it will work. The 6BR is too tight for that though.
Finally, they said that they are actually in the process of producing a 30BR competition seating die. The plans have been made, they just need to wait until a machine is available to produce them on. They estimate a few months away.
So, if you are a fan of that particular style of die (which I am), and you want a complete set straight away, buy the 7BR set and use the neck die with a 30cal bushing and ream out the seating die and you will be good to go.
If you don't want to ream anything, wait a bit longer and then you will be able to buy the 30BR seater off the shelf.