One of my 458's is on a Springfield 03 action. I would say it was built in the 1950's. The barrel a a short heavy 16 1/2" in length. The gun handles superbly and I would have liked to have used it in Africa. It was built by A&M in Prescott and is original in all respects so someone had the short barrel/handy theory even back then. Have never chronographed a load from it or any other rifle. I just use book values and trust them to be close. I have had no game complain, ever. Just lucky I guess.
