Regardless how your assay turns out Drew, you aren't going to prove anything with a sample size of one.

I thought it was generally agreed that the WP stamp simply indicated that the steel used in the product so stamped was, in the opinion of Winchester, simply the 'best' steel for the application.

'Winchester Proof' was used on a great many products over many, many, years it's difficult to imagine it represents a particular alloy.

"The price of good shotgunnery is constant practice" - Fred Kimble