Warning: I can not verify this post, as Fred Telke has been dead for ~30 years. It is true to the best of my knowledge.

My father-in-law shot a Kragicon competitively during the '20's to 30's. He experienced a cracked bolt lug. As a tool maker he had access to all the tools, and heat treating equipment needed. He had taken some college level metallurgy classes so he took the bolt to the prof. The professor concluded that the bolt was indeed brittle, but that one made of a different alloy, and heat treated properly would be much stronger. Fred made one and used it in competition for many years.

Unfortunately, after he married in 1939 the rifle was sold as he stopped service rifle competition.