Lyman Double Cavity Rifle Cast Bullet Mould casts bullet #245496, a .245" nominal diameter, 84 grain Round Nose Gas Check bullet. Designed by Guy Loverin. Holds lots of lube. Good for high velocity in 6mm (243) cal rifles. Uses Lyman Top Punch #203, Item #LYM2786749. Approximate Bullet Dimensions: Bullet Length-0.83", Bottom of Crimp Groove to Bullet Nose-0.28".