458 Lott - QuickLoad help

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26 November 2010, 22:34

Manyathelo

458 Lott - QuickLoad help

Need a favour from someone with quickload please. The following is the load data and i am interested in the pressure difference and predicted difference in velocity

Load 1
Calibre: 458 Lott
Powder: S355 (Somchem)
Weight: 77 grains
Bullet: 500 grain Hornady DGS
Primer: CCI 250
Case:Hornady

Load 2
Calibre: 458 Lott
Powder: S335 (Somchem)
Weight: 80 grains
Bullet: 500 grain Hornady DGS
Primer: CCI 250
Case: Hornady

Thanks

27 November 2010, 17:52

jro45

What kind of powder is the [somchem] I know it got to be a slow burning powder but I never heard of it. I use IMR4320 for my 458 Lott and I use IMR4350 with my 375 H&H, My 416 Rem Mag I
use RL15.

27 November 2010, 18:01

shootaway

77-80,500gr bullet- must be identical to H4895

27 November 2010, 23:55

capoward

quote:
Originally posted by Manyathelo:
Need a favour from someone with quickload please. The following is the load data and i am interested in the pressure difference and predicted difference in velocity

Assumption: 24” barrel length
Load 1
Calibre: 458 Lott
Powder: S355 (Somchem)
Weight: 77 grains
Bullet: 500 grain Hornady DGS
Primer: CCI 250
Case:Hornady
Velocity: 2185fps
Pressure: 61555 psi

Assumption: 24” barrel length
Load 2
Calibre: 458 Lott
Powder: S335 (Somchem)
Weight: 80 grains
Bullet: 500 grain Hornady DGS
Primer: CCI 250
Case: Hornady
Velocity: 2251fps
Pressure: 69077 psi

Thanks

As requested…please be aware that QL doesn’t seem quite as accurate with straight case cartridges as it is with bottleneck cartridges.

28 November 2010, 21:20

Cardinal

Yes, QL seems to have a lot of problems with the 458 Lott.
In my gun, I have to increase the case volume by 15-20% before QL's mv and the chrono match up.
Another example. I took the max load from a Norwegian reloading manual and tried it in QL. The software predicted pressures of 84-85k psi!
But the manual got those loads from Harald Wolf who had them tested by a proof house in Liege (IIRC).
So the proofhouse says its okay, ie below max pressure of 60-63k
And Ql said 85....

I tend to trust the proof house more.

30 November 2010, 14:32

Manyathelo

Thanks for the feedback

30 November 2010, 14:52

POP

quote:
Originally posted by jro45:
What kind of powder is the [somchem] I know it got to be a slow burning powder but I never heard of it. I use IMR4320 for my 458 Lott and I use IMR4350 with my 375 H&H, My 416 Rem Mag I
use RL15.

http://gsgroup.co.za/burnrates.html

01 December 2010, 03:41

jro45

Have you ever heard of Steves loads. That man has pretty near covered every caliber there is.
He has a web sight and its free to use. I wouldn't start with top load tho.

01 December 2010, 03:49

Ghubert

What is the OAL of your cartridge mate?

It could have a big effect on pressure.

01 December 2010, 04:32

Ghubert

quote:
Originally posted by Ghubert:
What is the OAL of your cartridge mate?

It could have a big effect on pressure.

Quickload suggests 79.6 grains of Somchem S341 for 2150 fps at 55Kpsi as the best load with SA powders.

I foundthis, maybe it's of some use to you.