It should be noted that the “burn rate charts” do not test the rate of burning in a firearm, but in a “bomb” chamber. The question is, how does this test method relate to the burn rate in actual firearms? Perusing pressure-tested load data shows that two powders with adjacent chart positions can switch rate places in different cartridges, or even with different bullet weights in the same cartridge.
Most charts don’t show how much faster one powder is than an adjacent powder in the chart; they may be virtually the same, or they may differ quite a bit, we don’t know. These charts are interesting, but they shouldn’t be used as a definitive guide to powder performance - IMO anyway.
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Last edited by DoubleRadius; 08/29/19.
