HR2D2, The oldest handloading book that I have is a lyman Ideal 34 made in 1940 and it doesn't give any loads either. It does give a special list of of Ideal Bullets. the 50-110-450 Win. uses a 450 grs cast bullet number 512138. It also lists the groove diamenter inches as .506. Twist of rifling is listed as one turn in 60 inches. It may have been loaded with Black Powder, but I don't know for sure.
Jim gave you good advice about checking it out with a gunsmith before you shoot it. I know this don't help much, but let us know what you find out Carl L.