Re: Lightening up a rifle by fluting ?
You can flute a "cut rifled" barrel after installation. (Rock, Krieger, Brux, Satern, Bartlein etc)
You should not flute a button rifled barrel after final lapping and definitely not after chambering. (Douglass, Broughton, factory barrels etc). Fluting a button rifled barrel alters the internal bore dimensions.