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Old November 18, 2012, 07:11 PM   #1
1stmar
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How similar are these powders?

The lgs has an abundance of accurate powders. I usually use imr4064 but they don't have it. They do have aa4064. Has anyone ever compared these 2? Can I use the same load data, should I expect the performance to be the same, velocity and accuracy? Treat it like any other lot change...
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Old November 18, 2012, 07:16 PM   #2
hodaka
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I have found the Accurate 4064 to be interchangeable with my IMR. Still work up the load just liike you are changing batches.
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Old November 18, 2012, 07:32 PM   #3
FrankenMauser
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They're very similar, as far as powder charge weight for a given cartridge/bullet combination. But, they are different powders and should be treated as such.

Velocity and accuracy are anyone's guess. Every rifle has its own preferences.
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Old November 18, 2012, 07:48 PM   #4
mehavey
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QuickLoad tells me they are not the same:

Equal weights (41.7gr) in a 308 behind a 168 SMK
AA-4064: 43,800psi/2,435fps
IMR4064: 49,000psi/2,470fps


Burn characteristics are different across the board:


ALSO (big also), Accurate is constantly getting their powders from different sources. Take extra care even changing lots.
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Old November 18, 2012, 07:59 PM   #5
Jimro
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Same powder, different lots. Both made in Canada, I assume at the General Dynamics powder plant.

As always with different lots, do another load workup accordingly.

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Old November 18, 2012, 10:18 PM   #6
mehavey
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Quote:
Same powder, different lots. Both made in Canada, I assume at the General Dynamics powder plant.
If so, they have changed sources again, from their time producing "XMR"4064 manufactured in Czech Republic by Synthesia.
(Anyone have a new container with the manufacturer's origin on it now?)

As noted from Helmut's actual QL enclosed bomb data above, his Accurate-4064 lot and his IMR4064 lot were quite a bit off from one another -- 5,000psi in the 308Win example shown.

Take care.....
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Old November 18, 2012, 10:26 PM   #7
FrankenMauser
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Even if they have been coming from the same place lately (I don't believe so), the granules are different - which changes burn characteristics.

AA4064 granules are approximately 0.055" long and 0.040" in diameter.
IMR4064 granules are approximately 0.080" long and 0.033" in diameter.

Different powders.
Treat them as such.
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Old November 18, 2012, 11:19 PM   #8
Jimro
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Accurate Arms lists AA4064 as "Made in Canada."

As far as I know, only the GD Valleyfield plant in Canada is putting out extruded rifle powders, I'd love to know if that isn't the case.

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