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 Post subject: Roll your own but don't slow your roll
PostPosted: Wed Sep 06, 2017 7:07 am 
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Brigadier General
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I was toying with the idea of branching out and reloading for 7.62x51 before I flew the coop to this garden paradice. I have plenty of one hundred seventy-five grain Sierra match king bullets and empty brass on hand but am now without my books and time to fill them.

Krag ammo was a straight forward proposition with two-twenty grainers over forty grains of IMR4350 so this should be no different. What loads are appropriate for a LRB gas gun?

And as an added note. Am I the only one who expects to see JR's posts when I jump in here?

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 Post subject: Re: Roll your own but don't slow your roll
PostPosted: Wed Sep 06, 2017 8:23 am 
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Site Admin
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Joined: Sat Dec 18, 2004 2:38 pm
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Location: Kalifornia
Quote:
For M1-M14-M1A's chamber pressures should stay at about 50,000psi and you should stay away from the 180's.


Quote:
Using the Hornady 168 BTHP Match bullet & 41.2 grns of IMR4895 in .308 brass shows 44,586 psi (which is in the "low" range);
using everything the same in 7.62x51 brass, pressure is 52,756 psi (which is in the "caution-high" range).


Quote:
Since the cartridge was designed to be the NATO standard military battle rifle cartridge, the military specification for the NATO round required a thicker brass cartridge case, and established a maximum chamber pressure of 50,000 psi. On the other hand, the commercial .308 Winchester has no such brass thickness specifications, and the SAAMI established maximum chamber pressure is 60,000 psi.



Am I the only one who expects to see JR's posts when I jump in here?


Nope, we all feel the void ! :(

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 Post subject: Re: Roll your own but don't slow your roll
PostPosted: Thu Sep 07, 2017 5:09 am 
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Surplus Ammunition's Master
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Joined: Tue Dec 28, 2004 3:50 pm
Posts: 4490
Location: NE Oklahoma
vanhahner wrote:
Quote:
For M1-M14-M1A's chamber pressures should stay at about 50,000psi and you should stay away from the 180's.


Quote:
Using the Hornady 168 BTHP Match bullet & 41.2 grns of IMR4895 in .308 brass shows 44,586 psi (which is in the "low" range);
using everything the same in 7.62x51 brass, pressure is 52,756 psi (which is in the "caution-high" range).


Quote:
Since the cartridge was designed to be the NATO standard military battle rifle cartridge, the military specification for the NATO round required a thicker brass cartridge case, and established a maximum chamber pressure of 50,000 psi. On the other hand, the commercial .308 Winchester has no such brass thickness specifications, and the SAAMI established maximum chamber pressure is 60,000 psi.



Am I the only one who expects to see JR's posts when I jump in here?


Nope, we all feel the void ! :(


YES!

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 Post subject: Re: Roll your own but don't slow your roll
PostPosted: Sun Sep 10, 2017 2:27 am 
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First Lieutenant
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Joined: Wed Nov 22, 2006 10:47 am
Posts: 233
The issue, with M1A and M1 Garands isn't so much chamber pressure as gas port/gas system pressure.

Stick to the correct burn rate powders.

Possibly buy an adjustable gas plug (have one on my M1 Garand, works great) if you want heavier bullets/slower powder.

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 Post subject: Re: Roll your own but don't slow your roll
PostPosted: Sun Sep 10, 2017 4:32 am 
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Joined: Sun Dec 13, 2009 2:46 am
Posts: 332
Location: Connecticut
If 4350 is all you have, your Krag load will only give you about 2200 fps with the 175 gr and 7.62 x 51.
You could step it up to 45.9 to get 2500, but there are way better powders for this load.


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