Hey guys, I am building a 28 Nosler with a Christensen Carbon Fiber 26" barrel on a Stock Remington Long Action, It has the magnum bolt face for the Nosler. I was going to go with a Gunwerks Clymr Carbon Fiber stock, I was going to order the Stock remington slip open hinged floor plate and internal box mag, my question is do I need the Magnum Internal mag setup or the Ultra Magnum, had several people tell me the Magnum and several telling me the Ultra, I would think it would be the normal Magnum but not 100 percent sure. any comments appreciated guys. thx