Originally Posted by jwp475
Originally Posted by Wildcatter264
RC,

After looking over the 460 G&A specs and drawings I’m having a hard time understanding how rechambering a standard 458 Win Mag barrel will leave part of the original throat. Please explain so I might better understand. 458 Win Mag case is 2.5” COAL is 3.34” both much shorter than 460 G&A specs.

As a matter of fact, it seems to make sense to start with a 458 Lott chambered barrel to rechamber to 460 G&A. Both cases are 2.8” long and COAL is 3.6”. What do you see as a problem with that plan?

BTW, I’m planning on a 23” barrel, probably a Douglas with a target weight of +/- 4 lbs. Target rifle weight is 10-10 1/2 lbs.


The 458 Win mag has a much longer throat than does the 458 Lott


Yes, indeed.

Here is a Manson reamer for .458 Lott (SAAMI)
and a Clymer reamer for .458 Winchester Magnum (SAAMI), side by side:

[Linked Image]

[Linked Image]

Here is a drawing showing that the throat of a SAAMI .458 Lott lives entirely inside the throat of a SAAMI .458 WinMag:

[Linked Image]

The Manson 460 G&A throat is living a little bit more so inside the throat of the .458 WM.
Infact, you will have an itty-bitty length of the SAAMI .458 Lott throat left if you rechamber one to .460 G&A without setting the barrel back an itty-bitty bit.

Ron aka "Rip" for Riflecrank Internationale Permanente
NRA Life Benefactor and Beneficiary
.458 Winchester Magnum, Magnanimous in Victory
THE WALKING DEAD does so remind me of Democrap voters. Donkeypox.