Burning Rate Chart

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When comparing different burning rate charts, one will notice variations in listed propellant ordering. Still, each such chart tells "the truth". Ranking differences result from use of different criteria. For example, a certain powder type can act slightly quicker than some other powder type, when used in 308 Winchester loads; however, when these powders are used in 7x64 loads, evident burning rates might reverse. Relative burning rate charts can never provide absolute data because too many factors are involved in how propellants burn within a cartridge chamber.

Eurenco Bofors produced the following chart, which we have published in our Norma Reloading Manual. Their ballisticians tested the same powder charge (43.2 grains) using the same bullet (143-grain FMJ) loaded in the 308 Winchester - they used IMR 4350 performance as a reference. This chart may not be any more accurate than any other but, compared to most, it does give significantly more information about how the relative burning rates were derived and it does relate to at least one real-world situation.

Any such data chart should be used ONLY as an INFORMATION GUIDE. Always refer to published data when reloading.