http://books.google.com/books?id=ycUOAAAAYAAJ&pg=PA614&lpg A Manual of Rules, Tables and Date For Mechanical Engineers, 1891 by Daniel Kinnear Clark
Wrought Iron 23-28 long tons = 51,500 – 63,000 psi (lbs/sq. inch)
Cast Iron 10.5 long tons = 23,500 psi
http://books.google.com/books?id=czsyAQA...p;q&f=false The Mechanical Engineer's Pocket-book of Tables, Formulae, Rules and Data: A Handy Book of Reference for Daily Use in Engineering Practice, 1893 by Daniel Kinnear Clark
Siemens 26-28 long tons = 58,000-62,700 psi
Whitworth 29.5-30 long tons = 66,000-67,200 psi
Some of these numbers are very likely marketing hyperbole:Winchester Nickel Steel, introduced in 1889, 100,000 psi
Winchester Proof Steel, developed for the Model 21 and introduced in 1931, 115,000-120,000 psi
Remington 1902 catalog states Remington Ordnance Steel has a tensile strength 110,000 lbs per sq. inch with an elastic limit of 60,000 psi
Marlin Model 21 Pump, introduced in 1907, “Special Smokeless Steel” 100,000 psi
S.A. Buturlin was a Russian Ornithologist who also published extensively on Hunting and Sporting Arms, including “Shotgun and Shooting It” in 1929; similar in scope as W.W. Greener’s “The Gun”
http://rutracker.org/forum/viewtopic.php?t=3524270 He referenced a 1905 study which I am unable to find
Steel Type............Max PSI (lbs/sq in)
Damascus -------------- 31,291 to 52,626
Typical 1905 Barel Steel --- 64,000
Winchester Standard Ordnance Steel ----- 39,400 (seems low?)
Winchester Nickel --- 88,600
Krupp Special -------- 85,340
Krupp 5 M ------------ 92,450
Bohler Antinit -------- 116,630
What is Krupp 5M?
Hunter Arms never made any psi claims, only this:
http://www.la84foundation.org/SportsLibrary/SportingLife/1898/VOL_30_NO_23/SL3023023.pdf Feb. 26 1898
Our famous Crown Steel (introduced in 1893 for the Pigeon Gun) barrels will now be put on our No. 2, $80 list gun regularly, with an option on the Damascus if preferred. After years of use on our No. 3 guns, we can cheerfully say that our Crown Steel barrels are a decided success in every way. In addition to this very important change we now offer you an entirely new design in engraving on this grade. It is neat and in keeping with a gun of this description
In regard to our No. 3 gun, $100 list, we come to you with something entirely new in gun barrels called Nitro steel. For months and months we have been testing these barrels to fully demonstrate to ourselves their qualities, and the result is most satisfactory. This Nitro steel comes the nearest to the Whitworth fluid steel of any gun barrel ever offered to the trade.
And for comparison:
AISI 1018 Low Carbon (Mild) Steel – 64,000 psi
AISI 4140 Chrome Moly – 95,000-100,000 but can be heat treated to much higher
I would be very happy if an engineer checked my math and numbers! 
