I had a No.1 Sporter in 45-70 and had JD Jones ream the throat to accept the Hornady 500gr FMJ solid. It was like a 458WinMag "special". I should have never sold that barrel. (I think I sold it in this forum!). I did it, though, to replace the barrel with a 445 Super Mag so I could distill my reloading process since I was already loading for 44Mag and previously loaded for 445SM for IHMSA. I later did another No.1 in 500S&W, but in hindsight, I should have stuck with the 0.458" caliber. Thanks for the pics! Nothing cooler than a No.1 in 458 Lott (or WinMag)!