win 303Congrats!. And I'm also wondering what bullet weht. Been reloading .303 British for over 20 years. Mht take the #4 Mk 1 out for whitetail this fall using 180 gr. Sierras.In Win 303-MSI Dragon Edition. Color. White. Case Type. Mid Tower. Case Material. Tempered Glass, SECC. MB Compatibility 12 x 10.7 ATX, Micro-ATX, Mini-ITX. Expansion Slots.