I will be coming into a rifle of this caliber soon. Case forming dies are included. What load would you recommend for fire forming brass to Ackley chamber? Present owner thinks rifle is unfired...if so, I would like to do some barrel break-in while fire-forming..would a start load of say 3000fps. or slightly under form case? (want to minimize copper fouling) I have bullets from 75 thru 117grs. Thanks!