I have a Kenton Industries ballistic turret, for the Vortex Viper HST 4-16x44. It is a for 30 cal. 180 grain Nosler Accubond 2800 FPS,60 degrees at 3500 feet, zeroed at 200 yards. This was made for a 300 WSM. I bought the scope from a guy that did not mount it. He had the turret made and then sold his gun to fund a new project. I would like $80, so I can have Kenton make me one for a .270.