A local gun shop with a great owner has a Green Mountain Barrel left over that is new in box. The barrel is 54 cal and is 1 in 7 twist. I am certain I can work out a trade as the barrel has set there on a shelf for well over a year. The twist seems mighty fast to me...why such a fast twist?...I assume heavy long bullets?...any recommended load data? Words of wisdom, various thoughts or smart remarks would be appreciated.