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Old August 16, 2015, 04:02 PM   #51
Slamfire
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Join Date: May 27, 2007
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The smokeless propellants we use are similar to the smokeless propellants used in rockets. Rockets operate at far lower pressures, though the load is huge because the pressure is in a big container. The propellant is almost always in the form or a thick cheesy solid substance. There are "layer" cake applications where one layer is a different burn rate, when that is burnt, the next layer might be faster, or slower, depending on the application.

Because our propellants are granular, you can't have the charge segregation you can have with rocket motors. Mixing different burn rate powders is too unpredictable. It might be possible to put a tube through the case centered around the primer. You could cast a solid propellant around that and have the primer ignite the top layer. Whatever gains there would be would be offset by the cost.
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Old August 17, 2015, 05:54 PM   #52
9MMand223only
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I think the bottom line is mixing powders is bad for the following reasons:

1) repeat-ability. Can you mix it exactly the same next time? And the batches of each powder add more complexity too it. The next batch of the same powder could require .4 grains to be the same as the last batch...so your doubling the variables of repeat ability...
2) Ease of use. Why mix when you can get sub MOA with 1 powder? Adding complexity without improved results.
3) Adding 30 grains of titegroup is not safe and that is 1 powder, etc. Just because you mix powders, doesn't mean its not safe by default. If you are doing 9 MM pistol, and your using 2 powders that say 5.0 grains is say 30,000 PSI, then obviously, mixing those 2 powders isn't compared with mixing titegroup and say...HS-6, which is a terrible idea.

no need to mix, #1 is all you need to not bother.
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