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Old 09-23-2009, 04:49 PM
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IMR 4064 and AA 4064

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Last week I bought some AA 4064 by mistake. It was right by the 5744 and the colors are almost the same and instead of picking up the 5744, I got home and saw I had 4064.
It may not be a big deal because I have used IMR 4064 for years in several of my bottle neck cases but I am having a hard time finding out just exactly what AA 4064 is. I can find some spotty load data but what I am wondering is, if it is the same as IMR 4064 or not. I haven't opened it up because I still have a few LBs of IMR in my cupboard and I will use it all first cause it is the oldest.
If you know what it is, I would sure appreciate a reply.

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Old 09-23-2009, 05:46 PM
The Troll Whisperer (Moderator)
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According to my burn rate chart, IMR4064 is slightly faster than AA4064, but charts can be misleading. I would start at the beginning recommended IMR loading and slowly work up to assure unexpected things don't happen.
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Old 09-23-2009, 05:56 PM
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Call or email Accurate Arms and they will give you all the load data you want. They are very helpful.
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Old 09-25-2009, 06:35 AM
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They can best be described a "fraternal twins". They're not identical but closely related. It's much the same as the several versions of 4227, 4895, 4831 and others. You can use A4064 in any cartridge you'd use IMR4064, but not in exactly the same charge levels at maximum. Below maximum, they're essentially interchangeable.

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Last edited by Rocky Raab; 09-29-2009 at 06:54 AM.
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Old 09-28-2009, 12:47 PM
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I never load at max with any powder unless I work up very carefully. I do like IMR 4064 and with the way any powder has been hard to find, I will use this up sooner or later.

I went to the Accurate Powder web sight and have not seen anything that compares the two powders. I did find load data but I like to check more than one source when I start working up a load.

Thanks for the responses
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Old 09-28-2009, 01:52 PM
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There is no exact comparison. Some Powders, like IMR4895 and IMR4064 will change order on the burning chart at different load pressures. I would just treat it as Rocky says, something suitable for the same cartridges, but for which you'll need to work up different charge weights. QuickLOAD suggests you will need around half a grain more of the Accurate product than the IMR product and that it will fill the case at a lower weight (has lower bulk density) and that it produces matching velocity at a little bit lower pressure. However, keep in mind your lot and the lot tested for the computer program may not match precisely, so that is just to give you some rough idea.
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