458 Win to 458 Lott conversion

[M70375!]

Hey Guys,
I am thinking about getting a model 70 458 Win mag and converting it to a 458 Lott, the Lott is a longer cartridge , so would I also have to have the magazine box made longer. Will the Lott chambering shoot the 458 win cartridges as accurately as a standard 458 win would shoot them.
Thanks Guys

 

[Wyatt Smith]

You should be able to get a 416 rem mag box and bolt stop. I doubt that’s all that will be required to make It feed 100%.

 

[Hunter4752001]

Consult a good gunsmith about your rifle. While the barrel work is easy, and the mag work may be doable, the question is whether the action length is sufficient without removing metal (not a question I can answer).

 

[Mekaniks]

Here is a previous thread about it...

H

Thread 'Rechambering Model 70 Safari Express in .458 Win Mag to .458 Lott'

Jul 19, 2021

What all would need to be done to rechamber a Model 70 Safari Express in .458 Win Mag to .458 Lott? Would it just be cutting the chamber to fit the Lott, or would the magazine well need to be opened up as well?

The .416 Rem Mag and .375 H&H both fit in the same action, so I'd think it'd just need the chamber opened up. I'd like to hear from anyone who has had this done, along with some gunsmiths they'd recommend to do the work.

• hammz
• Replies: 82
• Forum: Firearms & ammunition