Can the 300 mag be converted to a 458 Lott or 416 Rigby with just a barrel swap ? Thanks for any advice
You could easily convert a 300 WM to 458 Win Mag. A little bit of feed work is all it should take.
The longer 458 Lott will need mag and action mods. This will require a good smith who can make the right changes to the magazine and action. While it’s possible, a 416 Rigby IMO is too large a cartridge for this action. A 416 Rem mag would be a better option but you’d need mods similar to those for a 458 Lott.
If you have your mind set on a 416 Rigby try to find a CZ550 magnum. They’re discontinued but are a much larger action and better suited to a cartridge like a 416 Rigby.
