I currently have a 6 mm barrel w/ a 8 twist, and trying to decide on whether to go back with standard 243 or try one the 30 or 40 degree shouldered rounds.  Of the 3 in my subject heading which one will be easier to work with and I assume that FF ing can also be accomplished with the SLR round also?   Will Lapua brass or Hornady brass form w/o dounuts this way?  Any input appreciated.
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