Can anyone suggest a supplier for 243 Ackley Improved brass. The rifle I have will not permit closing the bolt on a factory 243 Winchester cartridge so I cannot fire form from factory ammo. It will also not permit bolt clousure with an empty 243 Lapua case. A friend told me I would have to turn the cases down inorder to load and chamber a regular 243 Win Lapua cartridge prior to fire forming. Can someone tell me where I can get brass already formed or help me with this issue on turning cases. Thanks Al.