458 Win Mag vs 458 Lott....The facts

[Riflecrank]

About those CEB drive bands ... more later.

 

[saswart]

The .458 WinMag with 500-grainer at 2170 fps and 3.406" COL is a low pressure load unless the Eland soft is a very weird bullet.
I would be surprised if that load had pressure over 60,000 psi.

In theory about the .458 Express 3" ?
.458 Express 3" throated like a SAAMI .458 WinMag and loaded in a Ruger No. 1 with the proper compressed load of slow-enough propellant to keep pressures below the 62,500 psi MAP of the SAAMI .458 Lott.
Is that the theory ?

BTW, CIP allows the same MAP to both the .458 WinMag and the .458 Lott.
What Norma specifies in their reloading manual:

458 Winchester Magnum: "4300 bar/62365 psi"

458 Lott: "4300 bar/62366 psi"

Rounded down for the WinMag and rounded up for the Lott.
1 psi advantage to the Lott.
Always trying to feather the nest of the .458 Lott !

CIP loads for the .458 WinMag are routinely .458 WM+ loads by SAAMI standards,
since SAAMI limits the .458 WinMag to 60,000 psi and allows the .458 Lott 62,500 psi.
They know they have to use higher pressures in the SAAMI .458 Lott to give it any advantage at all
versus the .458 WinMag.

Norma shows a 500-gr load for the .458 WinMag at 2175 fps from a 24" barrel of 1:14" twist.
with 73.5 grains of Norma 201.

Norma was so embarrassed by what they got for their .458 Lott, they decided to publish only reduced loads for the .458 Lott.

500-gr bullet in the .458 Lott at 2092 fps from a 24" barrel of 1:14" twist (not 1:10" per SAAMI/CIP)
with 75.9 grains of Norma 201.

More powder burned for less velocity. What's to like about that ?

Thanks Riflecrank - yes spot on, that is a Bertram case. We had another Big Bore shoot this past weekend, and the guy’s who’s case that is brought it to us and showed this exact mark. Brand new never been fired before. He was worried he would get case seperation, didn’t though. Next reload would be interesting! We all agreed this is not the case we would want near a rifle that would be hunting dangerous game.

 

[TOBY458]

I’m sure if all this shit talking was going on around a campfire or at the bar, everyone would be laughing and offering to buy the next round. Great discussion in my book!

 

[ldmay375]

Lol !!
A group photo, at morning coffee.

 

[M70375!]

Do not worry about African heat anymore than you do Texas or Arizona heat. It is a vestigial concern from the time when Brit’s took cordite loads to Africa.

In TX or AZ you are not hunting animals that might kill you if you gun locks up from to much pressure. And not all powders are temp insensitive.

 

[Red Leg]

In TX or AZ you are not hunting animals that might kill you if you gun locks up from to much pressure. And not all powders are temp insensitive.

I am not worried about it in Africa either with modern ammunition.

 

[hoytcanon]

There still many popular powders that can change pressure significantly over broad ranges of temperature. In Canada, I am often testing loads in minus 20-30 temps... I always check them on site for any hunt where there is a considerable temperature change.