Here is a good review: http://www.6mmbr.com/6improvedform.html
I personally have to form a false shoulder on my 6Ackley because is was chambered a little deep. I use a 0.257 expander (lots of lube) to open the neck and then just size a portion of the neck. Gives a good tight crush fit and forms good fireformed brass. Of course seating a bullet at the jam works well for most and I do this with my other Ackley chambers. Luck with your 6BRX. That will be one of my next 6 barrels to shoot F-open. Tim
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