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Message: <blockquote data-quote="criticalbass" data-source="post: 1198157" data-attributes="member: 711">The only fireforming I currently do is for my 338-06.  Just expand the '06 case mouth to .338, load a .338 bullet, and fire the round.  The unexpanded '06 case holds enough powder to shoot pretty well, and the expanded case will hold a few grains more.It is possible to do it by shooting 30-06 rounds in the gun, but it is wasteful and though it isn't supposed to do damage to the bore, I still don't like to do it.  I have seen information on fireforming by using some sort of wadding to create enough back pressure to form brass with no bullet involvement, but do not recall the details.  CB</blockquote>