I use 30-06 brass necked down to 6.5-06 at over 70,000 psi. I can't use 270 brass because the neck gets too long for the chamber that my 6.5-06 A square reamer made.....unless I want to trim brass:(
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. -Ernest Hemingway The man who makes no mistakes does not usually make anything.-- Edward John Phelps
