I too am trying to reload Hirtenberger brass, and rather than start a new thread, I thought it would best to restart this one to keep the information consolidated.
I am less concerned about the flash hole size, except to ask whether it is best to leave it small or enlarge it to the standard size for best performance.
My bigger concern is that I have not yet been able to resize it successfully. It has been fired once in a BCL102 (SS Match Barrel), and lightly lubricated and passed through the Redding National Match Full Length Re-sizing die. A doughnut is formed at the neck/shoulder junction (see picture below), and the brass, will not pass either the Whidden Gun Works, nor the Dillon case gauge test, nor will it chamber in the 102. I do not have this problem with Federal Cartridge brass. I am not brand new to reloading, and read and follow all directions that come with the dies.
I really want the Hirtenberger brass to work because the FC brass does not hold onto the primers that well.
Any help is appreciated. Thanks.