Forming 6BRX brass from Dasher brass

[Nowind0]

With the new 6 Dasher brass available, I was wondering if this would be a better starting point for forming 6BRX brass. Has anyone tried this? I understand that you would still have to fire form, but you may not have to make the false shoulder in the neck.
I have never fire formed brass before, so I may be missing something really important.

 

[dmoran]

@Nowind0
6BRX has a 30-degree shoulder (same as 6BR brass)
6Dasher has a 40-degree shoulder (so does the new Shirez/Norma Dasher brass)
You would need to size the new 6Dasher brass down to reform the shoulder, then fire-form it back out to match your chamber. Plus need to pre-trim (there 0.045" longer) unless you have an extended neck 6BRX chamber.
IMO - better off using 6BR brass and just fire-form.
Donovan

 

[swd]

This^^ and Norma Dasher brass is also a bit smaller at the .200" line which may or may not bulge the brass a bit near the head depending on your chamber.
Also BRX is incredibly accurate during fire forming. Other than a little wind drift they don't give anything up.