Original sentence: It is an 8 mm Remington Magnum case that has been "necked down" (narrowing the case opening) by 1 mm to accept 7 mm (.The 7 mm STW (Shooting Times Westerner) began as a wildcat rifle cartridge developed by Layne Simpson in 1979
Edited sentence: It is an 8 mm Remington Magnum case that has been "necked down" (narrowing the case opening) by 1 mm to accept 7 mm (.The 7 mm STW (Shooting Times Westerner) began as a wildcat rifle cartridge developed by Layne Simpson in 1979