Hi they are designed for shooting out of 308's at subsonic velocity through suppresed police rifles. the projectiles are safe to load at any velocity you would like to in a 308 bore. they are a FMJ if i recall and the loaded ammo from LApua had the base painted light blue for easy identification. The BC is designed for sub sonic use so it is not as good as a VLD but will work well.
Cheers Bill
Australia