Winchester actually chambered up and sold a few .458 Watt's rifles. I shot one, owned in 1972/3 by Lester Hatfield of Walcott Road, a rural road near Smithers, BC.

Les also had some loads, presumably that he got with the rifle when he bought it, State's side. Not sure when Les Hatfield brought his family up to that area- maybe early 60's?

I fired 3 shots and the stock split at the recoil lug, right down through and in front of the front guard screw.

The ammo was loaded with 600gr. RN Barnes .049" jacketed bullets and I think, case full of IMR4895. They kicked quite a bit.

Just thought you should know. As far as I know, there were very few of them built. Maybe Les knew someone