Is the 458 Lott a necked up 416 Remington Mag?

[bulletstuffer]

I just found a few pieces of brass that are stamped 416 Remington Mag.  They are necked up to 458.  Is the 458 Lott a necked up 416 Remington Mag? Can these be necked back down to the 416 and used as they were originally made as a 416 Rem?  Most cases run 2.82-2.84 inches. 

Thanks for the replys.

Bulletstuffer

[Grumulkin]

It's probably more proper to think of both the 416 Remington Magnum and the 458 Lott as necked up 375 H&H Magnum cartridges.

You should be able to neck your cases back down to 416 Remington Magnum diameter.  They may be a little longer or shorter then SAMI specs but probably not enough to be a significant problem.  In necking down, annealing might help to prevent split necks from excessive brass working.

[foxx1]

*8.mm REM mag is necked up to .416 , reformed to 416 REM MAG.

[mattl]

From your dimensions of the cases, it seems that they were blowm out to be used in a 458 Lott. And as Grumulkin said both are derivatives of the 375 H&H case.  You can form the case down to 416 Rem, but you may need some Case Formming Dies to form the case down from .458 to .416. 

[/quote]In necking down, annealing might help to prevent split necks from excessive brass working.
[/quote]
+1

[mattl]

*8.mm REM mag is necked up to .416 , reformed to 416 REM MAG.

Yes, and the 8mm Rem Mag is a necked down 375 H&H Mag.