Norma Whitetail .243 Winchester 100gr Brass Cased Centerfire Rifle Ammo, 20 Rounds, 20160462

243 Win. was originally a wildcat designed by Warren Page who necked down the .308 case in the early fifties. The goal was to make a light deer rifle which would have the advantages of the high velocity .22 calibers for varmint hunting. In 1955 Winchester made it a commercial round.