Well, the board is either fixed, or it's going to run terribly. Cross your fingers and hope for the best. I'm at my technical limit right now.

7.62x51 load needed

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Hippycrowe
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7.62x51 load needed

#1 Post by Hippycrowe » Thu Jan 17, 2019 4:51 pm

I just bought a M1a and have a Ar10 I need a load using IMR 4064(I have 15 pounds of it) my Ar 10 is over gassed a bit and shoots Nato Spec ammo with out stove piping and I might as well use the same ammo in the M1A I am getting. I am going to use a 150 grain FMJ and some soft tip 150 grain bullets for coyotes.l.

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RWS
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Re: 7.62x51 load needed

#2 Post by RWS » Fri Jan 18, 2019 9:45 am

Back in the 1970's C. E. Harris, one of the best technical advisors The American Rifleman ever had, provided load data for duplicating M80 ball ammo in military cases. M80 ball uses a 147 grain FMJ-BT bullet so the data can probably be safely used with the slightly heavier 150 grain bullets. Boattail would be better than flat base in that regard.

You can use a bit more powder in commercial cases but now you are no longer talking about duplicating the M80 round. Ditto for 150 grain bullets. I stick to M80 for my military rifles and use commercial cases with my bolt guns. YMMV.

In any event, here is what Harris published for IMR 4895 & 4064 powders, as well as WW748 (again, using USGI cases):

IMR 4895: 42.0 grains
IMR 4064: 44.0 grains
WW 748: 45.0 grains

I've used both the 4895 and 748 loads, and they both work well for my 7.62x51 M1A's and AR-10, but have never tried 4064 because of a few negative reports I have read that say the port timing is not good and allegedly has caused bent op rods. I have no personal experience to cite though so I have no idea how pervasive the problem is (if it exists at all).

-Bob

Hippycrowe
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Re: 7.62x51 load needed

#3 Post by Hippycrowe » Fri Jan 18, 2019 11:48 pm

Thanks for the info

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Re: 7.62x51 load needed

#4 Post by ammolab » Sat Jan 19, 2019 12:08 am

IMR 4064 is widely used in service rifle (M1A & M1 Garand) match loads. Federal/Lake city has used it in US Military production as well. Not sure if an “over gassed” rifle will find it optimum, but any standard 7.62 NATO rifle should run properly.

42grs with a 168gr Matchking is a widely used Match load. 44grs with an M80 ball bullet or SP will work on Coyotes.

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Re: 7.62x51 load needed

#5 Post by Hippycrowe » Sat Jan 19, 2019 10:40 am

I am going to put an adjustable gas plug on the m1a and put an adjustable gas block on my ar 10

The Ar 10 works perfectly with Nato ammo for some reason

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