I loaded my Win 70 with 420 grain gc bullets, I got very good accuracy and no leading at 1940 fps out of the 22 inch tube.
I bought the rifle from the original buyer who picked it up in the late 80's or early 90's and never fired it because of a work injury.
The only bullets fired out of it so far have been cast and only 5 of the 350 Hornady RN jacketed bullets, I know that's a sin, but I needed the brass from the rounds to build my cast loads with.
No more of those pesky j bullets will be fired from this rifle as long as the heavy cast continue to shoot.
My 420 grain cast 45-70 loads shot 1630 fps out of my guide gun, that 300 fps faster with the 458 is a real game changer.
Bear season opens in April here, I will be out looking for some spring bear for pepperoni.