To clarify some points, IMO the following is a fair summation of my opinions of the available data:
Krags and low-# 1903s are basically the same composition and respond in similar ways to a catastrophic overload, that is, the receivers tend to shatter rather than deform as would the double-heat-treats and Mausers
Some Krags and low-# 1903s have 'burnt steel' and are irretrievably weaker than the norm, but others can be annealed or otherwise re-heat-treated to improve their strength and there's no way to tell beforehand
There's enough missing and contaminated data from the early years to totally occlude a clear conclusion about a comparison
Normal loads will normally give no trouble even in faulty receivers since the main failure mode is from shock/vibration load rather than total applied force, meaning that usually, as long as the case head remains intact, the rifle will be fine. However a blown case head or a hammer blow might shatter a faulty example; the classic instance is that given by a gunwriter (whose stupidity was only exceeded by his ignorance or vice versa) who suggested that any suspect receiver be given a solid hammer whack across the feed rails to see if it would crack.(!)
As My Daughter the Teenager used to say, "Well DUUUHHH, Dad!" or as Gomer Pyle used to say, "Surprise, Surprise, Surprise!"
Some folks are apparently so stupid that IMO they shouldn't be allowed to even reproduce much less vote, but I digress...
IMO the reference to Sherman Bell was most apropriate, for his much-appreciated debunking of the damascus-barrel Old Wives' Tale. As I said before, I won't build a low-# but will shoot one any time.
Regards, Joe