In all fairness, this was actually a test of the safety lug system. Note which failed first (the rear of the receiver) and how it failed (shattered). As one on another forum has pointed out, this is only a one rifle test. Yes - the Krags were sufficiently strong for their intended purpose. Their was still such variability in things like heat treat and forging processes to make the strength of the entire lot suspect when it comes to increasing pressure beyond the original 40,000 CUP design load. One other point - had the locking lug still been intact on this test rifle, it would have likely cracked long before the receiver safety lugs failed.

I would add that 30 gr of Bullseye would likely blow any rifle up :D