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Re: 1680 Temp Sensitivity?
Seafire #9911868 05/20/15
Joined: Nov 2010
Posts: 37,084
Central Louisiana
D
Dirtfarmer Online Content
Campfire 'Bwana
Online Content
Dirtfarmer
Campfire 'Bwana
D
Joined: Nov 2010
Posts: 37,084
Central Louisiana
Originally Posted by Seafire
JB,

I disassembled some ammo a friend picked up at a garage sale for $5.00. It was pre WW 2 production 30/06 ammo with armor piercing bullets on them... he wanted the bullets to load up in a 300 Win Mag....

so I disassembled them and he let me keep the cases and the powder in them...deprimed the old primers and put new production in them...

the powder was IMR 4895 ( DuPont)... the cases were dated from 1936 to 1940.

I did an experiment testing the pre WW 2 powder against new production 4895. Test cartridge was a 22.250 with 55 grain bullets.

Velocity was pretty much the same over the chronograph....

but surprisingly accuracy champ was the pre WW 2 production 4895..

That old powder, if still good, works.

My lot of '60's vintage surplus H-4831 will shoot as well or better than new H-4831. And, when I bought that powder in the '60's, it wasn't new. So, no telling when it was made.

DF
GB1

Re: 1680 Temp Sensitivity?
Mule Deer #9914502 05/20/15
Joined: Apr 2004
Posts: 42,743
Southern Oregon USA
S
Seafire Offline OP
Campfire 'Bwana
OP Offline
Seafire
Campfire 'Bwana
S
Joined: Apr 2004
Posts: 42,743
Southern Oregon USA
Originally Posted by Mule Deer
It's not particularly temp-resistant, the reason I load H4198 in my .17 Hornet for hot-weather shooting.

What sort of ballistics are you getting?


got out with the chronograph this afternoon..

20 grains of AA 1680 with a Win Small Rifle primer in Remington Brass, with a 32 grain V Max..

results were:

1. 3666 fps
2. 3694 fps
3. 3679 fps
4. 3672 fps

brass expansion, was minimal.. neck sized it and it rechambered just fine...

maybe someone with Quick Load can do a pressure forecast for us..

outside temp was about 65 degrees and humid, and a thunderstorm was hot on the way... thundering and lighting in the distance... out on Forest Service land on a 4,000 mountain top...
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