Question for those of you who are loading for this cartridge: what brass are you using? I've seen Lapua available recently, but at around $1 per case I'm hoping that someone can point me in the direction of a less-expensive alternative that is still quality, even if it means necking a .308 or 7mm-08 down. These cases are for use in an AR10 chambered for .260 Rem, so I don't expect them to last the same number of rounds that I would get out of a bolt gun. Many thanks for your time.