What powder is Federal 308 match Ammo?

Articles say its a custom powder, but several military individuals familiar with the development say its a powder you can buy. The data card (obtained by Freedom of Information Act. request) says IMR4064. And description of the powder kernels from rounds taken down match either IMR3031 or IMR4064.

Given that FGMM uses IMR4064, its probably a good choice regardless.

At some point I'd like to run a temperarure test and compare it to Varget.
 
roberti11 said:
?? 41.745 ??

Since each grain of powder weighs 0.01 to 0.02 gn, what are they doing? Slicing the powder grains?? :)
Click to expand...

They didn't say that each case had 41.745 grains, with no variation. (it's obviously an average value. It could be a planned-beforehand-value, or it could be a calculated-after-the-fact value)

I'll bet that if you were to pull down 50 rounds and weight each charge to the nearest 0.1 grains, you would see:

  • an average weight between 41.7 and 41.8 grains
  • a variation from the lowest charge weight to the highest charge weight of at least 1.0 grains
  • probably at least 35 out of the 50 charges within a 0.5 grain interval centred around the average
 
Re post #22. You should never try to identify a powder from it's appearance as many extruded and ball powders powders look alike. What makes them different is their deterrent coatings which determined their burn rates.

No surprise that IMR 4064 is being used here. Even after the introduction of some of the newly hyped "miracle powders", old standbys like IMR 4064, 4895, 3031, W748, and BLC2 still get the job done very well in the .308.
 
We aren't talking about ball powders. We're talking about a very distinct extruded powder along with a reliable source that says you can buy it off the shelf.

Your advice is valid for someone trying to use an unknown powder they have in front of them. It carries no weight for someone looking at the powder in a round and then trying to find that powder by taking KNOWN powders and trying them by working up the load within the boundaries of the manufacturers published data. Please consider the context of the information before offering pointless advice.
 
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