Well this is interesting.
I was skeptical of the previously reported tensile testing so had it repeated. A segment had been machined from the
same sample for the previous test, so I have no explanation.
On retesting the tensile strength was 93,000 psi and yield strength 53,500 psi with a 17% elongation.
The barrel was AISI Resulfurized 1140 Manganese Modified Carbon Steel -
NOT Chrome Moly.
The industrial standard tensile strength for AISI 1140 is 88,000 to 100,000 psi. I couldn't find 1140 Manganese Modified.
Rightly or wrongly decided, Remington's use of 1140 Manganese Modified led to the Garza Class Action Settlement in 1997
http://www.gunsmoke.com/guns/rem_lawsuit_intro.html
