Possibly runs could provide evidence of his assertion that "nickel steel (same analysis basically as the later Winchester Proof Steel-that was just another marketing ploy by WRA)"

Winchester Proof Steel
https://www.doublegunshop.com/forums/ubbthreads.php?ubb=showflat&Number=573709

https://www.doublegunshop.com/forums/ubbthreads.php?ubb=showflat&Number=561800

Nickel Steel
https://www.doublegunshop.com/forums/ubbthreads.php?ubb=showflat&Number=563901