Thank you Dave and Craig.

For comparison

Winchester Nickel Steel from Bethlehem Steel Co. Jan. 1900
http://books.google.com/books?id=YzhUAAAAIAAJ&pg=PA181&lpg
Carbon .50%
Phosphorous .026%
Manganese .77%
Sulphur .037%
Nickel 4.0%
Tensile Strength 106,900 psi

1905 Krupp Chrome Nickel Steel Brand "D"
0.5% Carbon
3.26% Chromium
0.16% Manganese
1.26% Nickel
0.04% Phosphorus
0.03% Sulphur

Modern AISI 4140 Chrome Moly Steel
Carbon .38 - .43%
Phosphorous .035%
Manganese .75 – 1.0%
Sulphur .04%
Chromium .80 – 1.10%
Molybdenum .15 - .25%